MODE <nick> <+|-><modes>

User modes: (? designates that the umode is provided by an extension
             and may not be present on this server)

     USERMODE     DESCRIPTION
-----------------------------------------------------------------
         +o     - Designates this client is an IRC Operator.
                  Use the /oper command to attain this.
         +i     - Designates this client 'invisible'.
       ? +h     - Has a cloaked host. May be +x depending on cloaking module
         +g     - Deny users not on your /ACCEPT list from messaging you and
                  inviting you to channels.
       ? +u     - Receive messages that would otherwise be filtered server side
                  based on content.
         +w     - Can see oper wallops.
       ? +C     - Prevents you from receiving CTCPs other than ACTION.
         +D     - Deaf - ignores all channel messages.
         +G     - Deny users not on your /ACCEPT list and not in a channel
                  with you from messaging you and inviting you to channels.
                  This is a softer form of +g.
       ? +I     - Hides your idle time.
         +Q     - Prevents you from being affected by channel forwarding.
         +R     - Prevents unidentified users that you have not accepted from
                  messaging you.
         +Z     - Is connected via SSL (cannot be set or unset).