cold perm; cold wave
A type of permanent wave that uses chemicals without heat; common in Japanese hair salons. The term is wasei-eigo from 'design perm'.
wasei-eigo (Japanese-coined English), from design perm
I got a cold perm at the hair salon.
Cold perms are said to cause less damage to the hair.
Wasei-eigo from English 'design perm', referring to a cold permanent wave.