Kerning
Look up kerning in Wiktionary, the free dictionary.
In typography, kerning is the process of adjusting the space between two specific characters, or letterforms, in a font. It is not to be confused with tracking, by which spacing is adjusted uniformly over a range of characters.
In a well-kerned font, the two-dimensional blank spaces between each pair of characters all have a visually similar area. The term "keming" is sometimes used informally to refer to poor kerning (the letters r and n placed too closely together being easily mistaken for the letter m).
The related term kern denotes a part of a typed letter that overhangs the edge of the type block.