A salter is a structure that enabled deer to leap into an enclosed area but prevented them from leaving.
Historically, salters were prized and highly regulated as gifts from the monarchy.
[1] For example, in 1358, Edward III granted "for the king's special affection for Mary de Sancto Paulo, Countess of Pembroke, that for her life she shall have two deer-leaps in her park Fodryngeye.
Natural features were sometimes used, such as rock walls or ledges from which deer leapt, but were unable to leap back.
[3] In toponymy, the concern is that the root "salt" contained in the word resulted in misleading folk etymologies, particularly in place names with questionable connection to salt or individuals named Salter.