the.com/boneyard

means A storage site (or a slang term, as in dominoes/scrabble) for things withdrawn from active use but not quite discarded — often decommissioned vehicles or leftover game pieces.

from Literally a yard for bones — originally a place where animal carcasses or skeletal remains were dumped or processed, like a knacker's yard. The term later drifted figuratively to mean any place where retired, derelict, or disassembled things are parked and left to rust or rot: aircraft graveyards in the desert, ship-breaking docks, junkyards of old cars. Its use in games like dominoes and Scrabble (the pile of unused tiles) is a later, more playful extension of the same 'resting place for the unused' idea.