Ctrl+Alt+I Opens the Image size dialog. There are also Shortcuts and Preference setting for Zooming. Ctrl+0 Fits imag on screen, Ctrl++ zoom in. Ctrl+- zoom out, Ctrl+1 and Ctrl+Alt+0 display actual pixels zoom 100%.
There are keystrokes for entering symbols like © is entered holding down alt and using the number pad to enter 0169 other sysbols are done likewise. I know of no symbol table but that does not mean the isn't one.
Windows has a character Map panel to help enter symbols ¶®§¬£¢ However you need to also know the font being used they may differ between fonts.