A "shred", i.e., anything severed, as a fragment of earthenware (Job 2:8; Prov. 26:23; Isa. 45:9).
·noun A piece or fragment of a broken pot. ...
Webster's Dictionary of the English Language
also in Authorized Version "sherd," a broken piece of earthenware. (Proverbs 26:23) ...
William Smith's Bible Dictionary