n. ‘dE-“ri[ng]

A D-ring is a metal ring shaped like the letter D. Should not be confused with “d ring,” which is the innermost ring of Saturn.

Oh, the many uses of this industrial wonder! As shown in the second picture, it can be used as buckle for belts, bag straps, bag locks, etc.

*photos courtesy of u-handbag.com and yogaaccesories.com