Bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. The player is presented with several items on a screen from which to choose. A number of credits is revealed and awarded to the player when items are chosen. Some bonuses use a mechanical device, such as a spinning wheel. It works in conjunction with the bonus to display the amount won.
There is a light on top of the slot machine called Candle. It alerts the operator that change is needed, hand pay is requested or there is a potential problem with the machine.
Slot machines in a circle or oval formation are usually called Carousel.
A container where the coins that are immediately available for payouts are held is coin hopper. It is used to rotate coins into the coin tray when a player collects credits. A coin diverter is used to redirect excess coins into a drop bucket, or drop box when a certain preset coin capacity is reached.
Credit meter is used for displaying the amount of money or credits on the machine.
There is a container located in a slot machine's base that is used to divert excess coins. Typically, a drop bucket is used for low denomination slot machines. High denomination slot machines use a drop box. There is a hinged lid with one or more locks in a drop box and there ais no such lid in a drop bucket. The contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.
EMG is Electronic Gaming Machine.
To denote a payout made by a slot attendant or cage, rather than the slot machine the term Hand pay is used. A hand pay occurs when the amount of the payout exceeds the maximum amount that was preset by the slot machine's operator. Usually, the maximum amount is set at the level where the operator must begin to deduct taxes. A hand pay can also be a result of a short pay.
Hopper fill slip is a document used to record the replenishments of the coin in the coin hopper after it becomes depleted as a result of making payouts to players. The slip indicates the amount of coins placed into the hoppers, the signatures of the employees involved in the transaction, the slot machine number and the location and the date.
Playing Low Level or Slant Top slot machines you can sit as they have a stool. You can only stand playing Stand Up or Upright slot machines.
Optimal play is a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.
Payline is a straight or zigzagged line that crosses through one symbol on each reel, along which a winning combination is evaluated. Classic spinning reel machines usually have up to nine pay lines, while video slot machines may have as many as one hundred.
Rollup is the process of dramatizing a win by playing sounds while the meters count up to the amount that has been won.
The term Short pay is used to mean a partial payout made by a slot machine, which is less than the amount due to the player is called Short pay. It can happen if the coin hopper has been depleted as a result of making earlier payouts to players. In this case the remaining amount will be paid as a hand pay or an attendant will come and re-fill the machine.
Theoretical Hold Worksheet is a document provided by the manufacturer for all slot machines. The theoretical percentage that the slot machine should hold based on adequate levels of coin-in is idicated in it. The reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information is indicated in the worksheet.
Weight count is an American term, referring to the dollar amount of coins or tokens removed from a slot machine's drop bucket or drop box and counted by the casino's hard count team through the use of a weigh scale.

There are at least two types of slot players.
The first type is a persistent player.
This type of slots player is the one that believes the win is right around the corner. The machine can begin paying in any second.
Players become so persistent if they have already spent a lot of money for this slot and haven’t got anything or if they have found a slot machine that haven’t paid for a long period of time. They believe that a big win is sure to happen right now. The rush is that if they leave after depositing so much money in the machine it will erupt and the payouts will be often and large. Makes sense if you have lost 0. 00 and have yet to win. The machine can’t but paying.
Many years ago players have their own way of determining whether the machine has not paid out for a long period of time. They touch the coins to see whether they were cold or hot. If the coins were hot they believed that the machine had not paid for a long period of time. In fact the coins could be hot only because of the numerous lights that heated the coins.
Chaser is the next type of slot players.
The player believes the slot machine is not one of those machines that never pay. A sense of comfort exists between the slot machine and the player.