stallboard

\\ˈ ̷ ̷ˌ ̷ ̷\ noun

1.

a. : a display board formerly attached to the sill of a shop window and often hinging out into the street

b. : a stout sill or rail under the sash in a shop front

2. : any of a series of successively higher floors on which excavated material is pitched (as in digging sewers)