Are you American by chance? Because I can assure you that centimetres are everywhere here and both hectolitres and centilitres are fairly common, not to talk about decibel.

decibel is a bit of a special case, as that is essentially the only form anyone uses (I operate in a world that is decibel-heavy and I can't remember ever having seen a bel in the wild).

they do come up though, e.g. blood (dL)