The word "quirk" refers to a strange or unusual behavior or characteristic that makes someone or something unique or different from others. Full definition
I really don't, as the AC search engine is full of quirks of its own. (lazytravelers.net)
Though this is not always the case, likely each of your babies has their own quirks when it comes to sleep and later to sleep coaching. (twiniversity.com)
There are still a few quirks in need of a patch, but overall, this is as good as sound design comes and goes in games. (darkstation.com)