The author of µTorrent wrote in 2005, "I usually say 'you torrent' because it looks like a u", and offered "microtorrent", "mytorrent" (as "my" is the Swedish pronunciation of the Greek letter µ) and later "mutorrent" as alternate pronunciations [REF].
The symbol μ is the lowercase Greek letter mu, which stands for the SI prefix "micro-" meaning "one millionth".