YUV2 is YUV 4:2:2 video encapsulated in an Apple QuickTime file.

Sources:
http://ivlab.hku.nl/presentations/2005_final_presentation.mov
http://www.44mlb.com/images/44-001-engine-room.mov
http://www.pe.utexas.edu/2phaseweb/inclineslug2.mov
http://www.vetmed.wisc.edu/pbs/foodsafety/parasite/s_eel.mov
http://old.artun.ee/~tiia/cell/mov/xyy.mov