trochus
Noun
Meaning
Any one of numerous species of marine univalve shells belonging to Trochus and many allied genera of the family Trochidae. Some of the species are called also topshells.
Source: Webster's dictionaryDerivatives
Examples
Another possible source is the Latin trochus, meaning "iron hoop".
Manufacturing activity is modest, consisting mainly of a garment factory in Yap and production of buttons from trochus shells.