Probably a string of beads worn round the neck (Ex. 35:22; Num. 31:50). In Isa. 3:20 the Hebrew word means a perfume-box, as it is rendered in the Revised Version.
Easton’s Bible Dictionary
Tablet
Easton’s Bible Dictionary (1897), public domain. Text via Theographic Bible Metadata, CC BY-SA 4.0.