hammerbeam

or ham·mer beam

[ ham-er-beem ]
/ ˈhæm ərˌbim /

noun Architecture.

a short wooden beam projecting from an interior wall to support or tie together rafters or arched roof braces.

British Dictionary definitions for hammer beam

hammer beam

noun

either of a pair of short horizontal beams that project from opposite walls to support arched braces and struts