Guideposts [Heb. tamrûrîm] (Jer. 31:21); AV HIGH HEAPS; NEB SIGN-POSTS. The Hebrew word is synonymous in the parallel structure of the verse with Waymark. Perhaps the object was formed of a heap of stones (cf. tîmārâ, Joel 2:30 [MT 3:3]; “column,” Cant. 3:6; tōmer, “scarecrow,” Jer. 10:5). Jeremiah
guideposts. This term is used by some Bible versions to render the Hebrew word tamrûrîmH9477, which occurs only once (Jer. 31:21; KJV, “high heaps”). In this passage, the prophet admonishes the returning exiles to prepare for their journey by marking the route to help them find the way back.
The New Interpreter’s Dictionary of the Bible, Volumes 1–5
GUIDEPOST [תַּמְרוּר tamrur]. A word appearing only in Jer 31:21, the meaning and derivation of which are uncertain. Because it appears in parallel with the term ROAD MARKER, the two are usually considered synonymous and may represent stones piled along a path to mark the way.