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.
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Next to the 1 on the keyboard under escape
Character.
vn1898553
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.
The duration for which you hold down an alphanumeric key before the keyboard repeats the character is determined by the keyboard's "repeat rate" settings. This is typically adjustable in the operating system's keyboard settings, where you can set the delay before the repetition starts and the speed at which the character repeats. Factors such as the keyboard hardware and driver may also influence this behavior.
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.
Yes, every key on a keyboard is different from the others in terms of its function and the character it represents.