Knowability is the availability of epistemological resources to make sense of lived experiences. For Black girls and women, few epistemological resources exist that allow for understanding the experience of doing mathematics while Black and a girl. Efforts to promote equity for Black girls in mathematics context must be premised on a fundamental understanding of the emergent and enduring meanings, performances, and identities of Black girlhood. My work seeks to make such epistemological resources available and phenomenological realities known to the mathematics education community.