Question: What symbol did a Ghanaian stateswoman, teacher and artist known for designing Ghana's flag in 1957 use in that flag?
Sentence (from "Black Star of Africa"): The Black Star Line, founded in 1919 by Marcus Garvey as part of the Back-to-Africa movement, modelled its name on that of the White Star Line, changing the colour from white to black to symbolise ownership by black people rather than white people.
Relevant evidence: No