http://www.princeton.edu/pr/pwb/05/1024/2n.shtml
In the lower part a chevron, denoting the rafters of a building —> What does this mean???
https://www.houseofnames.com/wiki/ordinaries
The chevron occurs very frequently in British and French heraldry, and is comparatively rare in German heraldry. The chevron represents the roof of a house, derived from the French word “chevron” meaning rafter. It signifies protection. The chevron was granted to those who had participated in some notable enterprise, had built churches or fortresses, or had accomplished some work requiring faithful service.