Originally posted by: ThyName
i think that anbus are just awesome ninjas that have massive death skills. i mean sakura will never be an anbu, cause she cant do shit, but on the other hand sasuke could become one just like itachi. the other non anbu people can be strong but dont specialize in death, or retire like kakashi. so all people who can kill swiftly are promoted to ANBU. i wonder what ANBU stands for. maybe Amazing Ninja Big Ubercoolguy
ANBU is a Japanese acronym:
ANsatsu senjutsu tokushu BUtai (which means Assassinations and Tactics Squad)

you could always just look at the www.anbudom.net banner