Half Scissor Truss

scissor truss
A roof truss with an angled ceiling already built-in, used for rooms with a cathedral or vaulted ceiling, the pitch of the ceiling is normally half that of the roof.
A roof truss framed at the bottom by crossed intersecting beams like open scissors.
Roof truss designed with a bottom chord sloping upwards to an interior peak at the center of the building. Allows for increased interior clearance as the center of the building is approached. May require a steeper than standard exterior roof slope.

half
To the extent of half
half(a): consisting of one of two equivalent parts in value or quantity; "a half chicken"; "lasted a half hour"
To a certain extent; partly
partially or to the extent of a half; "he was half hidden by the bushes"
one-half: one of two equal parts of a divisible whole; "half a loaf"; "half an hour"; "a century and one half"