wa'-mark (tsyun): In Jer 31:21, "Set thee up waymarks," explained by the parallel, "Make thee guide-posts" (the King James Version "Make thee high heaps"). A sign or guiding mark on the highway.
Bibliography Information Orr, James, M.A., D.D. General Editor. "Definition for 'WAYMARK'". "International Standard Bible Encyclopedia". bible-history.com - ISBE; 1915.