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?