abdominal area of crab

(臍)
belly flap noun
the protective flap on the underside of a crab's thorax, also known as the apron

This crab has a wide, round apron, so you can tell it's female at a glance.

navel noun
the navel or umbilicus, typically used as a bound form

The medical staff are carefully tending to the baby's navel.

Frequency

Character
Written text
3,830th most common 3.50 per million
Movie subtitles
2,969th most common 3.63 per million appears in 2% of films
Word
Movie subtitles
0.890 per million appears in 0% of films
Written text
3.64 per million

Details

Traditional
Strokes
10
Unicode
U+8110

Sources