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First press the Alt key (and keep it depressed) with your left hand, then press the digit keys 1, 3, 0, in sequence, one by one, in the right-side numeric keypad part of the keyboard, then release the Alt key. Many special characters, however, for example λ (small lambda), cannot be obtained from their decimal code 955 (or 0955), by using it ...
Both computer symbols and accents fall under the umbrella of “special characters,” but the special characters keyboard is just your regular keyboard—with a few new hacks. ... Alt key codes ...
On IBM PC compatible personal computers from the 1980s, the BIOS allowed the user to hold down the Alt key and type a decimal number on the keypad. It would place the corresponding code into the keyboard buffer so that it would look (almost) as if the code had been entered by a single keystroke.
Ctrl+x, then r, then j, then letter of the window state register. Move the focused window Alt+Space then M [notes 10] then Arrow Keys. Press ↵ Enter to save new location and Esc to cancel Alt+Mouse / Alt+F3 then M then Arrow Keys. Alt+Mouse / Alt+F7 then Arrow Keys. Resize the focused window Alt+Space then S [notes 10] then Arrow Keys.
For example, here are the different “a” characters nested under the standard letter on the iPhone keyboard: It’s not just variants on standard letters you can find hidden in your keyboard.
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
Unicode characters can then be entered by holding down Alt, and typing + on the numeric keypad, followed by the hexadecimal code, and then releasing Alt. [2] This may not work for 5-digit hexadecimal codes like U+1F937. Some versions of Windows may require the digits 0-9 to be typed on the numeric keypad or require NumLock to be on. [citation ...
the most common special characters, such as é, are in the character set, so code like é, although allowed, is not needed. Note that Special:Export exports using UTF-8 even if the database is encoded in ISO 8859-1, at least that was the case for the English Wikipedia, already when it used version 1.4.