What do those symbols before channels in a WHOIS mean?

Usman

There are several symbols you may see prefixed to channel names in a user's WHOIS. These are:

@#channel (the user has operator status in the channel)
+#channel (the user has voice status in the channel)
<#channel (the user is invisible in a channel with channel mode +D or +d set)
-#channel (the user has user mode +d (deaf) set, and won't receive channel messages)