signal post1
/ˈsɪɡnl pəʊst/Military
noun
A position from which signals are made and received.
Origin
Late 18th century. From signal + post.
signal post2
/ˈsɪɡnl pəʊst/noun
A pole from which signals are made, especially on a railway by means of semaphore arms.
Origin
Early 19th century; earliest use found in The Times. From signal + post.