When certain symbols appear in a winning combination a special feature of the particular game theme is activated, which is a Bonus. In the bonus, the player is presented with several items on a screen from which to choose. A number of credits is revealed and awarded as the player chooses items. There are bonuses that use a mechanical device, such as a spinning wheel. To display the amount won it works in conjunction with the bonus.
Candle is a light on top of the slot machine. 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.
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.
Credit meter is used for displaying the amount of money or credits on the machine.
Drop bucket or Drop box is used for diverting exess coins from the hopper. It is generally used in low denomination slot machines. And a drop box is used for high denomination slot machines. A drop bucket doesn't contain a lid while a drop box contains a hinged lid with one or more locks. There is a scheduled basis on which the contents of drop buckets and drop boxes are collected and counted.
EGM is used as a short-hand for Electronic Gaming Machine.
A payout made by a slot attendant or cage, rather than the slot machine is Hand pay. 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. 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.
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 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.
Low Level or Slant Top slot machines include a stool so you can 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.
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.
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. In this case the remaining amount will be paid as a hand pay or an attendant will come and re-fill the machine.
The manufacturer for all slot machines provide them with a document called Theoretical Hold Worksheet. Basing on adequate levels of coin-in it indicates the theoretical percentage that the slot machine should hold. 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.
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.

Here is the list of the most amusing myths concerning slots.
You can spot a winning slot machine.
The only way one can say that theslot machine is a winning one is only to catch this moment, when the machine pays out. Slot machines use random numbergenerator and that's exactly that. Random.
Casinos place loose slots near the cashier, aisle ways, etc.
If this were true, it would be the only machines anyone would play. A casino mixes slots all over the casino floor. No one with any experience at playing slots would make a statement like this.
Count the number of symbols on the reels to determine your odds.
This is mathematically impossible, remember the RNG (random number generator) determines the stops. Thereare literally millions of combinations on a 3 reel slot machine, so there is no way of determining odds by the symbols on the reels alone.
Casinos can tighten or loosen slot machines from the back office.
It is not as simple as that. The casino can’t just change the chip of the slot machine. It is illegal and it has to be permitted by the commission.
A slot machine that has not been paying is due to hit.
Absolutely false. The RNG assures this. You have an equal chance of winning on a losing machine as you do on a machine that just paid out the jackpot.
Pulling the slot machine handle produces more wins than pressing the spin button and visa versa.
Again false. It makes no difference, as the computer only uses these as mechanisms to start the game. Only the computer determines a win or a loss and it has already determined if you are a winner or loser even before the first reel stops spinning.
Playing with hot coins improves your chances.
It is false. Nothing can affect the outcome, the machine doesn’t care and doesn’t know whether your coins are cold or hot.
Casinos set slot machines to payback more on the weekends.
One more rude mistake. The chances and odds are always the same. It doesn’t matter when you play.

The US
In the United States the availability of slot machines is highly regulated by state governments. There are a lot of states that 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. Several states allow slot machines only on licensed riverboats or permanently-anchored barges. Delaware allows to have slot machines only three horse tracks. There is State lottery commission to regulate them.

Native American Casinos
Slot machines are forbidden in Native American casinos located in reservations. But when the tribe first reaches a pact with the state in which it is located it is permitted. A pact entitles the state to receive a fraction of the gross revenue from slot machines.

Classes Of Slots
No federal law is created to govern slot machines. Each state has its own classification. There are restrictions on the type of slot machines that can be used in a casino or other gaming area in some states. A centralized computer system operates "Class III" (or "traditional") slot machines. The possibility that a player wing any payout is the same with every play. There are a lot of Class III slots in Nevada or Atlantic City. The term "Vegas-style slots" is iften used to denote them.
There are "Class II" slot machines ("video lottery terminals" or "VLTs") which are connected to a centralized computer system. The outcome of each wager is determined by it. The chance of winning a series of limited prizes is equal for each machine. There is a fee for each Class III game that the casino has to pay to the state. Class II games are not so tightly regulated by the state.

Characteristics Of Class II Games
The player is playing not against the casino but against other players. The prize is common. There is necessarily a winner in each game. The game is continued until someone wins. 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. The games are dependant on each other. The player must be an active participant. There is the same set of numbers for all players.

Class III Game Characteristics
The player is playing against the house. Each game is independent of previous games. Any possible outcome can occur in any game.

Clubs Of Slot Players
Free memberships in "slot clubs" is offered by many American casinos. Complimentary food, drinks, hotel rooms, or merchandise are called comps and this is the way a small fraction of the amount of money that is bet is returned to the players. These clubs require that players use cards to insert into the slot machines. The differences in the maximum theoretical returns can be significant thanks to comps or "cash back" from these clubs.

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. Australian-style gaming machines have video displays for stimulating physical reels. There are usually five of them. The laws regulating the use of gaming machines in Australia are a matter for State governments.
Gaming machines are found in casinos as well as pubs and clubs in some states. New South Wales legalized this style of gambling first. In 1956 they became legal in all registered clubs in the state.
In Western Australia only particular forms of gaming machine are used.

United Kingdom
Row of old fruit machines are usually known as fruit machines, one-armed bandits and AWP in Britain. Fruit machines can be met in pubs, clubs, arcades, and some take-away food shops. 3, 4 or 6 reels with around 16 or 24 fruit symbols printed around them can be found on the machines. These reels should be spun. Winnings are paid from the machine if certain combinations of fruit appear. These machines and slot machines seen in casinos and elsewhere around the world are very similar. But some extra features can be found. There exists a strict jackpot limit. There are some features of fruit machines in the UK. A player may be given the opportunity to hold one or more reels before spinning. The chance of winning can sometimes be increased. A finite number nudges following a spin can be also given to a player. A nudge is a single-step rotation of a reel of the player's choice.
The maximum payout for an individual game is different depending on the type and the location of the machine. Private members' clubs are allowed to have "club machines". Their jackpots are higher and they are allowed to charge more per game.
The manner of operation of these machines is different 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
The term pachisuro is used to denote Japanese slot machines. The traditional Japanese pachinko game is their ancestor. Slot machines are new phenomenon. There are slot machines in pachinko parlors and the adult sections of amusement arcades, known as game centers.
The machines are regulated with IC chips. 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.