Jachin and Boaz

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.

Source: Easton’s Bible Dictionary (M.G. Easton, 1897, public domain).