טַבַּ֫עַתn.f. signet, signet-ring, ring1signet-ring2ring, as ornament 3 most often (only in Ex.) of rings for staves of ark, for curtains, for ephod, and other sacred furniture
Strong Concise Dictionary Of The Words In The Hebrew Bible
H2885טַבַּעַתṭabbaʻath; from 2883; properly, a seal (as sunk into the wax), i.e. signet (for sealing); hence (generally) a ring of any kind — ring.