i can understand where all these names come from:

octothorpe, hash, pound (only in america), square, sharp, gate, grate, number sign, grid, crosshatch, pig-pen, tic tac toe (only in america too i expect as it’d be noughts and crosses here), mesh

i have no idea how these came about:

flash, scratchmark, thud, thump, splat, hex, crunch, reticule mainly i like the suggestion of calling microsoft’s c# language by the name “d flat”.