When certain symbols appear in a winning combination a special feature of the particular game theme is activated, which is a Bonus. 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. 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 alerts the operator that change is needed, hand pay is requested or there is a potential problem with the machine.
The term carousel is used to denote a grouping of slot machines, usually in a circle or oval formation.
There is a container where the coins that are immediately available for payouts are held called Coin hopper. The hopper is a mechanical device that 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.
Credit meter is a visual display of the amount of money or credits on the machine.
A a container located in a slot machine's base where excess coins are diverted from the hopper is Drop bucket or Drop box. Typically low denomination slot machines use a drop bucket. As for high denomination slot machines they use a drop box. A drop box contains a hinged lid with one or more locks whereas a drop bucket doesn't contain a lid. There is a scheduled basis on which the contents of drop buckets and drop boxes are collected and counted.
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 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.
Hopper fill is a document used for recording the replenishments of the coin in the coin hopper after it becomes depleted as a result of making payouts to players. The slip exists to indicate 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.
Low Level or Slant Top slot machines are equipped with a stool for you to sit and play. You will have to stand while playing Stand Up or Upright slot machines.
A payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game is called Optimal play.
The term Payline means 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.
The term Rollup is used to mean the process of dramatizing a win by playing sounds while the meters count up to the amount that has been won.
Short pay refers to a partial payout made by a slot machine, which is less than the amount due to the player. It can happen if the coin hopper has been depleted as a result of making earlier payouts to players. Then the remaining amount is paid as a hand pay or the machine is re-filled by an attendant.
A document provided by the manufacturer for all slot machines is 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.

I tis important to now what you are playing.
Always make sure that you insert the correct amount of coins into a machine. Your credits should be cashed out before you leave the machine.
Only if you have fun your gambling won't be stressful. You can increase your bets only when you are winning, and decrease your bets when you are losing.