A tooth, probably some conspicuous tooth-shaped rock or crag (1 Sam. 7:12), a place between which and Mizpeh Samuel set up his “Ebenezer.” In the Hebrew the word has the article prefixed, “the Shen.” The site is unknown.
Shen
1 verse
1 Samuel
1 Samuel 7:12
Then Samuel took a stone, and set it between Mizpeh and Shen, and called the name of it Ebenezer, saying, Hitherto hath the LORD helped us.
From Easton's Bible Dictionary
Matthew George Easton, 1897