Simply
The therefore sign is It is Unicode character U+2234, the short cut is ALT-8765
It is unlikely that you have a built in shortcut key. However, if you are using Microsoft Word you can set up a custom hotkey. A square root sign has character code 221A - you can find it under Insert: Symbol. From there you can set a keyboard shortcut; I've just set mine to Ctrl + SQ, which works fine. The standard shortcut key is "ALT"+ X
" ; " <------------- This is THE period sign on keyboard!!
A decimal sign on a keyboard would simply be a period.
change your keyboard
No, this sign is not found on a keyboard. However you can find π (pi) on the Character Map program.
there is not one on there
Ctrl+C to copy,Ctrl+X to delete,Ctrl+V to paste,Ctrl+S to save,Ctrl+O to open and many,many more click on little question sign in upper right corner and type keyboard shortcuts for additional help
On the keyboard find the < sign and next to it put the number 3, making <3. This works on any standard keyboard.
superscript
The keyboard symbol is... Ⓐ Just copy & paste
Shift+5
There is none on the keyboard.