is that halo is halo while girt is a horizontal structural member of post and beam architecture, typically attached to bridge two or more vertical members such as corner posts.
As a verb girt is
to gird or girt can be (gird).
As an adjective girt is
(nautical) bound by a cable; used of a vessel so moored by two anchors that she swings against one of the cables by force of the current or tide.