Key terms explained in plain language and in the context of practice.
A pair of letters typed one after the other, like TH or ER. Layout designers score keyboards on how comfortably their most frequent bigrams flow, which is why some letter pairs feel fast and others fight the hand.
A keyboard whose keys sit in a straight grid instead of the offset rows inherited from typewriters. Columns line up under the fingers, so each finger moves straight up and down rather than diagonally.
The group of keys placed under the thumbs on many split keyboards, usually holding space, backspace, enter and layer switches. It moves work onto the strongest digit, and it is the part of a split transition that takes longest to relearn.
Words per minute, the standard measure of typing speed. A "word" is fixed at five characters including the space, so 60 WPM means 300 characters a minute regardless of how long the actual words were.
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