Pulsars are detected by their regular pulses of radiation - hence the name. If I remember correctly, that is radio waves. Before the nature of pulsars was known, the first pulsars discovered were named LGM-1, LGM-2, LGM-3, and LGM-4 - where LGM is short for "little green men". An astronomers' joke.

Liftgate Control Module ( LGM ).

Little Green Men!! :-) A pulsar [See related] was observed in July 1967. Initially baffled as to the seemingly unnatural regularity of its emissions, they dubbed their discovery LGM-1, for "little green men"

Lgm

Probably Mp5.

AUG by level 12

LGM by level 20

Barret by level 35