e.g. a timetracker tool "squatted" the "t". I'm the one to decide if this tool is that important to get a one-letter. In this case I had to hack around, fork even, to be able to use t (which is my todo.txt stuff: t, tt, ta, tl, tp, etc) and to use the timetracker (b - no idea why I started using the b for this, decades ago: b, bl, bs, etc).
If a developer of a tool decides to "squat" one of the 27 letters in the alphabet, I think they have delusions of grandeur: You are quite certainly not building one of the 27 most important tools ever built.