where is the pound key on a phone?

[Lillie Pittman]

[Rich]

Lower right corner... Looks like a 'Tic Tac Toe' sign....#

[crimsonrosalie]

3rd row to the right, 4th row down. It is also called a hashtag symbol. It looks like #

[ScσττRΛSC³]

is the pound sign/key. More commonly identified as a Twitter hashtag (though that's 2 different realms there).

[Jordan]

Bottom right, also called a hashtag, looks like this #