Artist's impression of the binary pulsar system PSR J0737-3039. Credit: John Rowe Animation
Two pulsars in orbit around their mutual center of gravity. The first such system to be discovered was PSR 1913+16, also known as the Hulse-Taylor Pulsar.
More generally, a system in which a pulsar orbits any other type of star; examples include the Black Widow Pulsar and Centaurus X-3.