snap hairpin; triangular hairpin
A hairpin with a triangular shape that snaps shut to hold hair in place. Common in children's hairstyles.
I put a snap hairpin in my daughter's hair.
The snap hairpin broke right away.
Common kanji-katakana spelling for this hair accessory.
Variant using 止め instead of 留め; both are seen.
From the onomatopoeic パッチン (snap sound) and 留め (fastener). The exact origin is uncertain, but it likely emerged as a descriptive term for this type of hairpin.