Need help with mac keymap. switched from linux to mac

Hi,

I switched from linux to mac and I don't understand the symbols on the Mac OS X keymap.  I am using intellij 13.

I have the small wireless keyboard so I saw on this forum that I should probably be on Mac OS 10.5 + keymap.  Is this correct?

What key is the chunky up arrow?
What key is the tilda with upper right dash?
What key is caret?

Thanks

Tara