A special feature of the particular game theme, which is activated when certain symbols appear in a winning combination is called Bonus. The player is presented with several items on a screen from which to choose. After choosing items a number of credits is revealed and awarded. There are bonuses that use a mechanical device, such as a spinning wheel. It is used in conjunction with the bonus for displaying the amount won.
There is a light on top of the slot machine called Candle. When change is needed, hand pay is requested or a potential problem with the machine appears it flashes.
A grouping of slot machines, usually in a circle or oval formation are called Carousel.
Coin hopper is a container where the coins that are immediately available for payouts are held. 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.
To display the amount of money or credits on the machine Credit meter is used.
Drop bucket or Drop box is a container located in a slot machine's base where excess coins are diverted from the hopper. Typically, a drop bucket is used for low denomination slot machines. And a drop box is used for high denomination slot machines. The difference between a drop box and a drop bucket is a hinged lid with one or more locks. There exists a scheduled basis for collecting and counting the contents of drop buckets and drop boxes.
EMG is Electronic Gaming Machine.
The term Hand pay means 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. At the level where the operator must begin to deduct taxes the maximum amount is set. A hand pay can also be a result of a short pay.
There is Hopper fill 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 are shown with the slip.
Low Level or Slant Top slot machines are equipped with a stool for you to sit and play. You can only stand 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.
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.
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. If the coin hopper has been depleted as a result of making earlier payouts to players the short pay happens. An attendant will come and re-fill the machine or the remaining amount will be paid as a hand pay.
Theoretical Hold Worksheet is a document provided by the manufacturer for all slot machines. It indicates the theoretical percentage that the slot machine should hold based on adequate levels of coin-in. 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.
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 is called Weight count.

To know what you are playing is necessary for you.
You should know exactly how many coins you are supposed to insert into a machine. Before leaving a machine cash out your credits.
Just have fun. Slots should be fun, not stressful. If you feel lucky increase your bets and vice-versa.

The USA
In the United States the availability of slot machines is regulated by governments. Many states have established gaming control boards to regulate the possession and use of slot machines. Nevada is the only state that has no significant restrictions against slot machines. In New Jersey slot machines are allowed only in hotel casinos operated in Atlantic City. In some states slot machines are allowed only on licensed riverboats or permanently-anchored barges. Only three horse tracks are allowed to have slot machines in Delaware. State lottery commission regulates them.

Native American Casinos
Native American casinos located in reservations are not permitted to have slot machines. When the tribe first reaches a pact with the state in which it is located it gets the permission to have them. According to the pact a fraction of the gross revenue from slot machines is received by the state.

Classes Of Slots
No federal law is created to govern slot machines. Their classifications may vary from state to state. Some states have restrictions on the type of slot machines that can be used in a casino or other gaming area. A centralized computer system operates "Class III" (or "traditional") slot machines. The chance of winning any payout is the same with every play. Class III slots are most often seen in Nevada or Atlantic City. "Vegas-style slots" is another name for them.
"Class II" slot machines ("video lottery terminals" or "VLTs") are connected to a centralized computer system. It determines the outcome of each wager. The chance of winning a series of limited prizes is equal for each machine. The casino pays a fee to the state for each Class III game. The state doesn't regulate Class II games so tightly.

Class II Game Characteristics
The player is playing against other players. They are competing for a common prize. There is always someone who wins. The game stops when the winner appears. There is a certain number of wins and losses in a given set of wins. The combimation can occur again only after a new batch is initiated. There is a dependence of between the games. The player must be an active participant. There is the same set of numbers for all players.

Characteristics Of Class III Games
The house plays against the player. Each game is independent of previous games. There can be any possible outcome in any game.

Clubs Of Slot Players
In American casinos there are "slot clubs" the membership of wich is free. A small fraction of the amount of money that is bet is returned in the form of comps. The cards are used to insert into the slot machines in these clubs. Comps or "cash back" allows to make the differences in the maximum theoretical returns significant.

Slots In Australia
Queen of the Nile is a poker machine that is very popular in Australia. The term Gaming Machines is officially used to denote Australian slot machines. Physical reels are stimulated by video displays in Australian-style gaming machines. There are usually five of them. There are laws regulating the use of gaming machines in Australia which are created by State governments.
There are Gaming machines not only in casinos but also in pubs and clubs in some states. New South Wales was the first state to legalize this style of gambling. In 1956 they were made legal in all registered clubs in the state.
Western Australia only permits the use of particular forms of gaming machine.

United Kingdom
In Britain slot machines are known as fruit machines, one-armed bandits and AWP. Fruit machines can be met in pubs, clubs, arcades, and some take-away food shops. These machines commonly have 3, but can be found with 4 or 6 reels with around 16 or 24 fruit symbols printed around them. These reels are spun. The machine pays winnings if certain combinations of fruit appear. These machines and slot machines seen in casinos and elsewhere around the world are very similar. But there are some extra features. The jackpots from these machines are limited. There are some features of fruit machines in the UK. A player is given the opportunity to hold one or more reels before spinning. This can sometimes increase the chance of winning. A finite number nudges following a spin is given to a player. The term nudge is used to denote a single-step rotation of a reel of the player's choice.
The maximum payout for an individual game is influenced by the type and the location of the machine. There are "club machines" in private members' clubs. They charge more per game and have higher jackpots.
These machines differ from American slot machines. The jackpot can be won in each game independently.
The AWP fruit machine is popular across Europe and in countries such as the Czech Republic, Russia, and Ukraine.

Japan
Pachisuro are Japanese slot machines. The traditional Japanese pachinko game is their ancestor. Slot machines are a fairly new phenomenon. Pachinko parlors and the adult sections of amusement arcades, known as game centers have them.
IC chips regulate the machines. There are six different levels changing the odds of a "777". There is a variety of slot machines but there exist rules and regulations for all of them.