noun
navel piercing; belly button ring
Refers to both the piercing itself and the jewelry worn in it. The abbreviation へそピ is also used colloquially.
See also: へそピ
夏に向けて臍ピアスを開けた。
I got my navel pierced for the summer.
彼女はキラキラした臍ピアスをつけている。
She's wearing a sparkly belly button ring.