or rather "oak of the pillar" (that being the real signification of the Hebrew word elon), a tree which stood near Shechem and at which the men of Shechem and the house of Millo assembled to crown Abimelech the son of Gideon. (Judges 9:6)
Smith’s Bible Dictionary
Pillar, Plain of the
Smith’s Bible Dictionary, William Smith (1863). Public domain, from the CrossWire SWORD module.