Pressing the "Alt" key while typing a code on the number pad on Windows results in a special character. Press the "Opt" key on Mac to find special characters like the "Alt" key on Windows. On Linux and Chromebooks, you can press Ctrl + Shift + U to type any Unicode character, as long as the font you're typing it in supports it.

In Windows, you can type any character you want by holding down the ALT key, typing a sequence of numbers, then releasing the ALT key.

To insert an ASCII character, press and hold down ALT while typing the character code. For example, to insert the degree (º) symbol, press and hold down ALT while typing 0176 on the numeric keypad. You must use the numeric keypad to type the numbers, and not the keyboard.