I vaguely recall that when spelling a word with a double letter like "Anne" or "ville" in spoken French (say, spelling your name to someone over the phone), one would not say
"V, I, L, L, E"
but rather say
"V, I, deux L, E"
"V, I, double L, E"
but I don't remember whether it is "deux" or "double." I tried searching on Google and on this site, but I can't seem to find this discussed anywhere.