Any steeple, tree, windmill, or other object, serving to guide the seaman into port, or through a channel.
·noun Any conspicuous object on land that serves as a guide; some prominent object, as a hill or ste...
Webster's Dictionary of the English Language
A boundary line indicated by a stone, stake, etc. (Deut. 19:14; 27:17; Prov. 22:28; 23:10; Job 24:2)...
Easton's Bible Dictionary