This red and black star has been used as a symbol of Quaker service since the late 19th century unofficially, and was officially adopted (with some changes) by the American Friends Service Committee [1] in 1917. Another variation on it is used by the British organization Quaker Peace and Social Witness [2].
self-made SVG file vectorized from File:Quaker star-T.png
AnonMoos, based on image files and symbol