What is blu?

Some articles on blu:

Looney Tunes And Merrie Melodies Filmography (1950–1959) - 1956 – 29 Titles
... Flighty MM Robert McKimson Daffy Duck, Foghorn 1956-02-18 Blu-Ray - LTPC Volume 2, Disc 1 Yes First and only cartoon in the classic era to co-star Daffy Duck Foghorn Broom-Stick Bunny LT Chuck Jones Bugs Bunny ... Coast Bunny LT Chuck Jones Bugs Bunny, Nasty Canasta 1956-07-21 DVD - LTGC Volume 4, Disc 1 Blu-Ray - LTPC Volume 2, Disc 2 No Final appearance of Nasty Canasta Rocket-bye Baby MM Chuck Jones ... Pig 1956-09-29 DVD - LTGC Volume 1, Disc 2 Blu-Ray - LTPC Volume 2, Disc 1 No Yankee Dood It MM Friz Freleng Elmer Fudd, Sylvester 1956-10-13 DVD - LTGC Volume 6, Disc 2 Yes Co-prod ...