Like a milestone, only to indicate the course of a track rather than its distance (Jer. 31: 21, AV; ‘road markers’, NRSV; ‘signposts’, REB, NJB).
Citation for waymark
Citation styles are based on the Chicago Manual of Style, 15th Ed., and the MLA Style Manual, 2nd Ed..
MLA
"waymark." In A Dictionary of the Bible. Ed. W. R. F. Browning. Oxford Biblical Studies Online. May 21, 2013. <http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2017>.
Chicago
"waymark." In A Dictionary of the Bible. , edited by W. R. F. Browning. Oxford Biblical Studies Online, http://www.oxfordbiblicalcstudies.com/article/opr/t94/e2017 (accessed May 21, 2013).