Slope

The slope a spaceship (more generally any moving object) with displacement (n, m) is the maximum of m and n divided by the minimum of m and n if both are non-zero, zero otherwise:

Hence, the slope of an orthogonal spaceship is 0; the slope of a diagonal spaceship is 1; the slope of a knightship is 2; etc.

Also see
gollark: It's apparently related to the emission spectra of the metal ions in it.
gollark: I think I have one at home slowly degrading and probably releasing vaguely dangerous chemicals.
gollark: It's Discord's chemistry channel in most ways that count.
gollark: Exciting new battery technologies never seem to actually go anywhere.
gollark: Weird, but... sure?
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