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Herbig-Haro object

(HH, HHO)
(illuminated nebula from colliding jets)

A Herbig-Haro object (HH or HHO) is a small, glowing nebula resulting from the collision of the plasma of a jet from a protostar with the surrounding ISM. They are found on the order of a parsec from the protostar. Sometimes the a single such star has two HHs, star, i.e., from its opposing jets. They are found in star-forming regions, often near Bok globules.


(protostars,jets,star formation,nebulae,object type)
Further reading:
http://en.wikipedia.org/wiki/Herbig-Haro_object
PrefixExample  
HHHH 36generic designator

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