Wherever you go in the world, there is usually a little sub culture when it comes to slot machine games.
Each country appears to have different names and aspects to their slots. In the UK, they are often known as fruit machines thanks to the traditional symbols of lemons and cherries which were part of the early slots.
Even though you do not see those symbols nearly as much on video slot machines, if someone says they are off to play the fruity you know they are heading to the nearest slots game they can find. British fruit machines also offer features you do not see elsewhere, most notably the nudge, where you can move the reels down 1 or 2 places to get a line of winning symbols.
In Japan, the culture is very different with pachislo machines. These have spinning reels which the user stops, rather than waiting on the luck of the draw and there is a set time by which the reels must stop. There is also meant to be a maximum 15 coin payout, but this can easily be circumvented through jackpot modes.
For some reason, in Australia, slots are known as poker machines, which is usually abbreviated to pokies, even though they are quite different from video poker. They seem to be among the more complicated slot machines out there, with more than 25 winning lines. Regulation of pokies is done state by state.
The American term is usually slots, and they are the dominant force both in live and online casinos, with the 5 reel video slot by far and away the most popular and traditional form of entertainment.