Playing with slot machines is simple and easy, but there are a few phrases you should get to know, which will help make the pushing of buttons and spinning reels a lot more fun.  Here are some of the words you'll most probably encounter while playing slots online.

Coins – these are the number of coins played in the round. Denominations, on the other hand, are the face value each coin has. Most casinos have a maximum of three to five coins per pay line.

Pay line – this is the imaginary line that crosses some or all the reels, depending on the type of slot game you are playing. Pay lines are used to calculate the number of coins you could potentially win. Classic reels have single pay line, while newer reels could have more than 20 pay lines.

Bonus Multiplier – this is the multiplier used by many casinos and is triggered when you hit the bonus on an active pay line and it is usually given when players are playing with the maximum number of coins allowed.

Bonus Symbol – this is the icon on the reel that when hit, along with other similar symbols, would trigger an in-game bonus feature, free spin, or bonus coins.

House Edge – this is the percentage of the total bets and wagers that goes in favor of the casino as its revenue. Most slot machines have 2% to 8% house edge; meaning, for every dollar spent on the machine, the casino collects two to eight cents as revenue, or for every pound spent, the casino keeps an average of between two and eight pence as revenue.

Payback Percentage or payout percentage - the amount or percentage from total bets that are 'returned' to slots players in terms of winnings during normal operation, which includes thousands or even hundreds of thousands of spins. Most casinos have payout percentages that range from 92% to 98%; therefore, for every pound spent between 92 and 98 pence is returned as winnings, or for every dollar spent on the machines, 92 to 98 cents are returned as winnings.

Wild Symbol – this is an icon on the reel that can be used to build a winning combination. Some casinos use wild card symbols, and some don’t. Slot machines using wild symbols make use of different wild symbol designs, which depend on the theme of the slot. Some wild symbols also act as a bonus symbol, which, in turn, increases the number of coins you could potentially win.

Scatter Symbol -  an icon on the reel that could enable you to win a free spin. Collecting the specified number of scatter icons anywhere on active pay lines will give you free spins and other items.