Bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. Several items on the screen are presented to the player to choose. As the player chooses items, a number of credits is revealed and awarded. There are bonuses that use a mechanical device, such as a spinning wheel. The amount won is displayed with the help of it in conjunction with the bonus.
A light on top of the slot machine is Candle. It flashes to alert the operator that change is needed, hand pay is requested or a potential problem with the machine.
A grouping of slot machines, usually in a circle or oval formation are called Carousel.
Coin hopper contains the coins that are immediately available for payouts. It rotates 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.
A visual display of the amount of money or credits on the machine is called Credit meter.
A a container located in a slot machine's base where excess coins are diverted from the hopper is Drop bucket or Drop box. A drop bucket can usually be found in low denomination slot machines. A drop box can be found in high denomination slot machines. A drop box contains a hinged lid with one or more locks whereas a drop bucket doesn't contain a lid. The contents of drop buckets and drop boxes are collected and counted by the casino on a scheduled basis.
EGM is a short-hand for Electronic Gaming Machine.
Hand pay refers to a payout made by a slot attendant or cage, rather than the slot machine. A hand pay occurs when the amount of the payout is more than the maximum amount that was preset by the slot machine's operator. 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.
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 is Hopper fill. The are shown with the slip.
A stool is included into Low Level or Slant Top slot machines, so you can sit and play. You will have to stand while 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.
The term Payline is used to denote 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.
If a partial payout made by a slot machine is less than the amount due to the player it is called Short pay. If the coin hopper has been depleted as a result of making earlier payouts to players the short pay happens. Then the remaining amount is paid as a hand pay or the machine is re-filled by an attendant.
The manufacturer for all slot machines provide them with a document called Theoretical Hold Worksheet. It indicates the theoretical percentage that the slot machine should hold based on adequate levels of coin-in. The worksheet also indicates the reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information.
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.

To know what you are playing is necessary for you.
It is important to know the correct amount of coins that should be inserted into a machine. Before leaving a machine cash out your credits.
Only if you have fun your gambling won't be stressful. Be smart and change oyur bets according to your luck.