Non-alphanumeric characters on the keyboard are those that are neither alphabetic nor numeric. Examples are commas, underscores, colons and semicolons.
Non Alphanumeric means that it doesn't consist of letters or numbers.
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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.
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.