A breast is an organ that produces milk for suckling. In heraldry, the usual breast is the human (woman’s) breast, sometimes explicitly blazoned so. It’s a period charge, found in the canting arms (from the colloquial “dug”) of Dodge, 1531 [Dennys 144]. The breast must always be depicted distilling gouts, to distinguish it from a roundel; Society rulings require the gouts to have some contrast (i.e., not be the same tincture) as their breast.
Tetchubah of Greenlake bears as a badge: A human breast azure distilling three gouttes argent.
Æðelhild æt Liðerlande bears as a badge: A breast sable distilling gouttes argent.
Ismeralda Franceska Rusciolelli da Vale bears as a badge: A human breast proper distilling three gouttes d’Or.