When I'm programming, I find useful to use some unicode symbol like ← ↓ → to indicate in comments different things.
In ubuntu I can type ← ↓ → respectively with ALT GR + Y, ALT GR + U, ALT GR + I.
But to get the symbol "↑" I have to type CTRL + SHIFT + U , and then
2191 (i.e. I have to insert the unicode code).
Is there a shortcut for the upwards arrow? If there isn't, how could I manually add it?