Easton's Bible Dictionary: M. G. Easton, M.A., D.D.
A pole (Heb.to'ren) used as a standard or ensign set on the tops of mountains as a call to the people to assemble themselves for some great national purpose (Isa. 30:17). In Isa. 33:23 and Ezek. 27:5, the same word is rendered "mast."