Reels is a casino term used to refer to the horizontal columns in video slots where all the symbols are located. Whenever you pull the reel or click on the Spin button, the reels start spinning. Before they come to a stop, the combination will be revealed.
Slot machines are more conventional than video slots and usually come with three to five reels. However, there are thousands of video slots out there, and video slot providers have experimented and created quite a few unique-looking video slots. Some of those titles have up to seven reels, while others have horizontal reels or even two separate sets of reels within a single video slot.
Regardless of the shape and size, if it has symbols on it and it spins, it’s a slot reel.