Typing

Compose key

On Linux, I have my AltGr key mapped to Compose. This allows me to type symbols like ¶ and § by entering the right sequence of keys (AltGr+p+! and AltGr+s+o respectively). To get a list of all available combinations, type the following in the terminal (via Ask Ubuntu):

 cat /usr/share/X11/locale/en_US.UTF-8/Compose