The names of two brazen columns set up in Solomon’s temple (1 Kings 7:15-22). Each was eighteen cubits high and twelve in circumference (Jer. 52:21, 23; 1 Kings 7:17-21). They had doubtless a symbolical import.
Easton’s Bible Dictionary
Jachin and Boaz
Easton’s Bible Dictionary, M. G. Easton (1897). Public domain, from the CrossWire SWORD module.