In the movies it doesn't stand for anything in particular. But George got the idea from a roll of film while making American Grafitti labled, R2D2 or, Roll Two Dialouge Two.
R2-D2 is his full name. His nickname is R2
R2-D2 is an astromech droid and C3PO is a protocol droid.
Me
length of dct2=d2-(r1-r2)
The up, down, left, right and space.
R2-D2 is his full name. His nickname is R2
R2-d2
R2-d2
R2-d2
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r2-d2
R2-D2 was the small robot that carried the plea for help by Princess Leia and was discovered by Luke Sykwalker in the first movie(4th in series).
R2-D2 was separated by the Ewoks.
Definatly R2 D2
R2 D2 by far
R2-D2 (Artoo-Detoo) .