bra

noun2

1. •
   a thing women wear under their clothes, with two cups that hold the breasts in place

   • Her housecoat had fallen open. She was wearing only panties and bra, which did nothing to make her scrawny, wrinkled body appealing. — 1968
2. •
   One of the two vectors in the standard notation for describing quantum states in quantum mechanics, the row vector; the other (column) vector being its complex conjugate, the ket.