Look up display ASCII, or display ASCII Chart. There's a few different ones!
Those are various Symbols that are behind all the numbers and letters, etc. on the keyboards,
In your Operating system is maybe one or Two Ascii Character Sets locked into the OS program that will present
on the screen or display what each letter or number is of the -256 Characters in few ACSII Code locked in
that one will see.
On a laptop
26 X 2 = 56 Character keys
25 x2 = 50 number, punication, symbols
!0 X 2 = 20 function keys (maybe)
plus various support keys shift, Alt tab, Caps, Cap lock
In the end it's short of using much the total of 256 ASCII Key Set up.
There 3rd tier Spare characters to make 256 characters
Most are Math based Like a true Degree Symbol (little zero-upper right) and some are just Goofy,
Using Alt key(hold down) and type a number like 178 (alt 178) one gets these funny characters. This is the third tier of displayable objects that
are behind usually a number key sequence, the same letter capitalized, or ALT same letter.
Laptop keyboards don't lean themselves to holding or using but see these will display the key inputs used of another ASCII Code
of another OS. Not everyone creates their OS the Same.
A full keyboard like ones with "arrow back", positional Up , Down, a Two (usage) function Keys, one can create these ASCII characters.
