Letter

A letter is this: a or b or c or d etc...
Those letters are used in words but by themselves, they are nothing
Or a mail send to someone

I send a letter to you
Example 2
Random letters: hdcjjfgbsgh

What the heck

Used immediately when your network broke
Used when you had a fucking bad day

Network broke

Man: what the heck?!

Example 2

Keybord stopped

Man: WHAT THE HECK!