Well you've used thirty of them in your question.
All the letters, all the numbers, all punctuation and a host of other characters too. Look up a list of asci code numbers and you'll see every character available. Though to answer your question not all these characters are actually on your keyboard.
Any letter, number, symbol, etc. that you can type into a text document is a character.
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Character.
vn1898553
Next to the 1 on the keyboard under escape
ALT keyboard symbols or (character map) can be found with every version of Windows. Keyboard symbols are also called character sets.
tilde
The comma is the button to the right of the m (towards the bottom of the keyboard) on a qwerty keyboard.
I think if it's an old computer keyboard it is a pound sign (£), but if it is a new keyboard it is that line thing, like this: - but vertical, not horizontal.
Alpha refers to the "at" sign, as in an email address i.e. john.doe@something.com. On a standard English (American) keyboard, this character is achieved by pressing "shift-2."
No, this sign is not found on a keyboard. However you can find π (pi) on the Character Map program.
For a windows user, you will use the "character map"
Character refers to the characters on your keyboard. Map is the way the computer sees the location of the keys and translates them into what character appears on your screen. File is a bit obvious but it is the location of the character map on your computer system. In other words it is how the computer knows what to put on the screen when you press a key. If you have a special keyboard and want characters to show up properly then you need the right character map. This might be language differences or keyboard layout. Hope this helps.