Listed here are all available user modes and their default letters. The letters can be changed in the configuration.
ircop = 'o' # IRC operator (o)
invisible = 'i' # invisible mode (i)
ssl = 'z' # SSL connection (z)
registered = 'r' # registered nickname (r)
service = 'S' # network service (S)
deaf = 'D' # does not receive channel messages (D)
admin = 'a' # server administrator (a)
wallops = 'w' # receives wallops (w)
bot = 'B' # marks user as a bot (B)
cloak = 'x' # hostname cloaking (x)