A casino operations glossary explains the working language behind the gambling floor: drop, fill, credit, hold, theo, comp, marker, handpay, TITO, surveillance review, incident report, internal control, KYC, AML, and variance. These words are not decoration. They are how casino staff describe money, risk, games, players, and proof.
Quick Facts
- “Drop” is not profit.
- “Hold” is not the same thing as house edge.
- “Theo” is an estimate, not the exact amount a player lost.
- “Comp” means reinvestment, not generosity without cost.
- “Surveillance review” is not the same as a security response.
- “Marker” is formal casino credit paperwork, not a casual promise.
- “Variance” can be normal, but repeated unexplained variance is never ignored.
Why Casino Language Matters
Casino staff do not use special terms just to sound important.
They use them because vague language is dangerous in a casino.
If a floor supervisor says, “The table did well,” that could mean many things. The table may have high drop, high win, high hold, strong ratings, fast pace, or simply one lucky hour. Those are different facts.
If a cashier says, “The money was short,” the next question is: short compared with what record? Counted cash? System total? Chip inventory? Ticket redemption? Drawer balance?
If a host says, “He deserves a comp,” management should ask: based on actual loss, theoretical loss, average bet, time played, trip history, or personal pressure?
Clear terms stop the casino from running on feelings.
This glossary is built for readers who want to understand the back-of-house language used in Back of House, How Casino Operations Work, and Casino Departments Explained.
Core Terms by Category
Use this as a working map before going into the longer definitions.
| Category | Terms you will hear | What the category really means |
|---|---|---|
| Money movement | Drop, fill, credit, cage, count, chip bank, cash variance | How cash, chips, tickets, and records move through controls |
| Game performance | Hold, win, drop, coin-in, decisions per hour, floor yield | How the casino measures activity and results |
| Player value | Theo, average bet, player rating, comp, reinvestment rate | How the casino estimates a player’s worth over time |
| Surveillance and security | Incident report, review, BOLO, trespass, back-off | How the casino protects games, people, and property |
| Compliance | AML, KYC, SAR, internal control, exclusion, source of funds | How the casino protects the license and meets legal duties |
| Staff operations | Shift log, handover, relief, rotation, coverage ratio | How the casino keeps work organized across shifts |
A term is only useful if staff understand where it belongs.
“Credit” can mean one thing in table-game chip movement and another thing in player credit. “Hold” can mean one thing for slots and another for tables. “Surveillance” can mean a department, a process, or a review request depending on context.
Context is part of the definition.
Working Glossary
Average Bet
Average bet is the estimated average wager a player makes during rated play. It is used in player rating and theoretical loss calculations. One large bet does not automatically define the average.
AML
AML means anti-money laundering. In casinos, AML controls are designed to reduce the risk that gambling activity is used to disguise the source, movement, or ownership of money. FinCEN publishes casino guidance for financial institutions because casinos can face financial-crime risk.
Back-Off
A back-off is when a casino stops or limits a player’s play, usually without accusing the player of a crime. It is different from a trespass or cheating accusation. This topic connects to Why do casinos back off players?.
Cage
The cage is the casino’s controlled cash and chip operation. Guests may see the cashier window, but the cage function also connects to chip banks, redemption records, transaction controls, and reconciliation. See cage for the short glossary entry.
Chip Bank
The chip bank is the controlled inventory of casino chips. It supports fills, credits, table inventory, and cage control. Chips look like game pieces, but inside the casino they are money instruments.
Coin-In
Coin-in is the total amount wagered through a slot machine or slot system. It does not mean the player physically inserted that much cash. A player can generate high coin-in by recycling credits through repeated play.
Comp
A comp is complimentary value given to a player, such as food, hotel, free play, or other benefits. From the casino side, a comp is usually a reinvestment decision tied to player value. See comp and How do casinos calculate comps?.
Count Room
The count room is the controlled area where dropped cash or other gaming funds are counted and reconciled. It is not just a back office with money on a table. The point is control, separation of duties, and an audit trail.
Credit
In table-game operations, a credit often means chips being moved back from a table to the chip bank or cage. In player finance, credit can mean casino-issued credit documented through formal procedures. Do not mix the two meanings casually.
Decisions Per Hour
Decisions per hour means how many resolved game outcomes happen in one hour. It matters because house edge needs volume to become meaningful. A slow table and a fast table with the same rules can produce different expected results.
Drop
Drop is money collected from gaming activity into controlled storage, such as a table drop box or machine-related cash system. Drop is not profit. It is a measure of money entering a controlled casino process. See drop.
Expected Loss
Expected loss is the amount a player is mathematically expected to lose over time based on total wagering and house edge. It is not a promise about one session.
Fill
A fill is a controlled movement of chips to a table. A table needs a fill when its chip inventory is low. Fills are documented because chips are value. See fill.
Handpay
A handpay is a slot payout that requires staff involvement instead of being paid automatically through the machine. The reason may involve jackpot size, system rules, tax requirements, machine limits, or property procedure.
Hold Percentage
Hold percentage compares casino win to a base figure such as table drop or slot coin-in. It is an operating result, not the same as house edge. A game can have a known house edge and still show unusual hold in the short run.
House Edge
House edge is the built-in mathematical advantage of the game over time. It helps explain expected value, but it does not predict the exact result of a short session. See house edge.
Incident Report
An incident report records a notable event: dispute, injury, intoxication issue, disruptive behavior, suspected rule breach, security response, or unusual operating problem. A good incident report separates facts from opinions.
Internal Control
Internal control means the checks, records, approvals, separation of duties, and procedures that protect the casino operation. Nevada publishes Minimum Internal Control Standards, which show how formal these control expectations can be in regulated gaming.
KYC
KYC means Know Your Customer. In casino operations, it can involve identity checks, risk awareness, source-of-funds questions, account information, and compliance review depending on the jurisdiction and transaction type.
Marker
A marker is a formal casino credit instrument or record. It should not be treated like an informal IOU. See marker.
Over / Short
Over or short describes a variance between what should be present and what is actually counted. A small one-time variance may be a mistake. Repeated variance becomes a management problem.
Player Rating
Player rating is the casino’s record of a player’s gambling activity, often including average bet, time played, game type, and sometimes decisions or pace. It helps estimate player value. See player rating.
Reinvestment Rate
Reinvestment rate is the percentage of theoretical player value returned to the player through comps, offers, free play, rooms, food, or other benefits. Too low can lose players. Too high can damage profit.
SAR
SAR usually means Suspicious Activity Report. Requirements depend on jurisdiction. The safe way to understand SARs is this: casinos must have systems for identifying and escalating certain suspicious financial activity. This page does not give evasion advice.
Slot Hold
Slot hold is the casino win from slot play divided by coin-in. Players often confuse slot hold with the posted or theoretical RTP of a game. They are related but not the same operating view.
Source of Funds
Source of funds refers to questions or checks about where a player’s money comes from when risk, regulation, or transaction size requires attention. It is a compliance concept, not a personal insult.
Surveillance
Surveillance is the casino function that observes, reviews, documents, and supports game protection and incident investigation. It is not the same as security. See surveillance and How do surveillance teams work?.
Table Hold
Table hold is table win divided by table drop. It tells management what the casino kept from money entering the table drop, but it can swing heavily over short periods.
Theoretical Loss
Theoretical loss is the amount a player is expected to lose over time based on average bet, time played, game speed, and house edge. It is central to comps and player value. See theoretical loss.
TITO
TITO means ticket-in, ticket-out. It is the ticket system used by many slot machines. TITO reduces some cash handling on the floor, but it does not remove the need for ticket control, redemption records, and system monitoring.
Variance
Variance is the gap between expected results and actual results. In gambling, variance is normal. In operations, unexplained variance still needs attention because money and records must match.
Back of House Example
A new floor supervisor says during handover:
“Table 12 was busy, we filled it once, and the player in seat 4 was strong.”
That sounds useful, but it is not enough.
A better handover says:
“Table 12 had one fill, no open dispute, high baccarat action from seat 4, rating started at 21:10, average bet estimated at 300, surveillance review requested for one late-bet complaint, no adjustment made.”
That version uses operational language.
It tells the next supervisor what happened, what was recorded, what remains open, and where risk sits.
Casino language is not about sounding clever. It is about giving the next person enough truth to continue the shift.
From the Casino Side:
The casino cares about terms because terms become records.
If staff use sloppy language, records become sloppy. If records become sloppy, decisions become hard to defend. That matters in disputes, audits, compliance checks, security reviews, player complaints, and management investigations.
A word like “suspicious” should not be thrown around casually. A phrase like “player was rude” is weaker than describing behavior. A note like “cash issue fixed” is not enough if nobody can tell what the issue was, who approved the fix, and what record supports it.
Good terminology protects everyone: the player, the employee, the supervisor, the department, and the business.
The UK Gambling Commission publishes compliance guidance for gambling businesses, and the American Gaming Association maintains a Responsible Gaming Regulations and Statutes Guide. The exact rules vary by jurisdiction, but the principle is steady: casinos need clear records, defined responsibilities, and controlled language around sensitive issues.
Common Mistakes
| Term people misuse | Common misunderstanding | Cleaner explanation |
|---|---|---|
| Drop | “The casino won this amount.” | Drop is money collected into the system, not profit. |
| Hold | “This is the house edge.” | Hold is an actual operating result over a period. |
| Theo | “The player lost this much.” | Theo is an estimate of expected loss, not actual loss. |
| Comp | “The casino gave something free.” | A comp is usually reinvestment from expected value. |
| Surveillance | “Security watched it.” | Surveillance reviews and documents; security responds physically. |
| Marker | “The player borrowed money.” | A marker is formal casino credit documentation. |
| Variance | “Something is wrong.” | Variance can be normal, but it must be understood. |
The most expensive mistake is using the right word with the wrong meaning.
Hard Truth
In casino operations, loose words become loose records, and loose records become weak control.
FAQ
Why does casino terminology sound so specific?
Because casinos handle money, gambling outcomes, disputes, player value, credit, surveillance, compliance, and staff decisions. Specific terms reduce confusion.
Is drop the same as win?
No. Drop is money collected into controlled storage or systems. Win is what the casino kept after gaming results. A table can have high drop and still lose money in a short period.
Is hold the same as house edge?
No. House edge is the mathematical advantage built into a game. Hold is an actual operating percentage measured from results such as win divided by drop or coin-in.
Why is theoretical loss important?
Theoretical loss helps casinos estimate player value over time. It is used in comp decisions, player development, marketing offers, and profitability analysis.
Why do staff care about average bet?
Average bet helps estimate player value. A player making one large wager and then small bets should not be rated the same as someone steadily betting high for hours.
Is a comp really free?
It may feel free to the player, but it has a cost to the casino. From the business side, it is a calculated reinvestment decision.
What is the difference between surveillance and security?
Surveillance observes, reviews, and supports documentation. Security handles physical response, safety, access control, and guest or staff protection.
Are these terms the same in every casino?
No. Local laws, company policy, jurisdiction, casino size, and gaming product mix can change terminology. The operating ideas are usually similar.
Deeper Insight
Good casino language does three jobs.
First, it describes the event.
Second, it points to the responsible department.
Third, it creates a record that can survive later review.
That last part matters most.
Casino work happens fast. A dealer may finish hundreds of hands in a shift. A slot floor may handle many service calls. A cage may process constant transactions. A security team may handle several situations that never become dramatic. A host may talk to many players and still need to remember which promises were actually approved.
Without shared language, every shift becomes a fog.
That is why “the player was upset” is weaker than “player disputed a blackjack payout after hand completion; floor reviewed layout; surveillance requested; no adjustment made.” The second version may not be beautiful writing, but it tells operations what happened.
Casino language is not poetry.
It is control.
Formula / Calculation
Table Hold % = Table Win / Drop
Slot Hold % = Casino Win / Coin-In
Theoretical Win = Average Bet × Decisions Per Hour × Hours Played × House Edge
Comp Value = Theoretical Loss × Reinvestment Rate
Cash Variance = Counted Cash - Recorded Cash
Formula Explanation in Plain English
Table hold percentage tells management how much the casino kept compared with table drop. Slot hold percentage compares casino win to total slot wagering. Theoretical win estimates expected casino earnings from play over time. Comp value estimates how much the casino may justify giving back to a player. Cash variance shows whether the counted money agrees with the recorded money.
These formulas are simple, but they stop important terms from becoming vague opinions.
Related Reading
Use the Back of House hub as the main map. Start with Back of House Basics if you want the beginner view, How Casino Operations Work if you want the operating flow, and Casino Departments Explained if you want the department structure. For a fast reference page, continue to Back of House Quick Reference.
Useful glossary pages include house edge, theoretical loss, player rating, comp, cage, drop, fill, marker, and surveillance. Related player questions include How do casinos calculate comps?, How do surveillance teams work?, and Why do casinos back off players?. Game examples connect to Blackjack, Baccarat, Roulette, Craps, Slots, and Video Poker.