hairpin
US /ˈher.pɪn/
UK /ˈher.pɪn/

1.
a U-shaped pin for fastening the hair in place
:
•
She secured her bun with a few hairpins.
•
He found a small, decorative hairpin on the floor.
2.
a very sharp bend in a road or path
:
•
The car struggled to navigate the steep hairpin turn.
•
The mountain road was full of dangerous hairpins.