1) The scalar or vector potential of a time varying current or charge distribution.
2) A scalar or vector potential that is generally thought of as useless and hated by many physicists.
3) The possibilty for someone to be retarded.
We are learning about retarded potentials in our E/M course.
That guy has a retarded potential, hes a total idiot.
In Dirac Notation of quantum mechanics, the representation of a state. The complex conjugate of a ket. Denoted as <f| where f can be a wave function or a set of quantum numbers. Analogous to a row vector in linear algebra. The name originates from separating a bracket ( <f|f'> ) into a bra ( <f| ) and a ket ( |f'> ).
<nlm| is a bra representation of the Hydrogen atom with quantum numbers n, l, and m.