On personal computers running the Microsoft Windows or DOS operating systems, additional characters to those available in the current keyboard layout can be typed using an Alt code: pressing and holding the Alt key while entering a character code with the keyboard's numeric keypad.
Often this is the best or only method many computer users know for entering non-ASCII characters. Due to its popularity, the input method has been duplicated, including the use of obsolete code pages, to other operating systems. Many Wikipedia articles on various characters will include how to type that character using Alt codes for code page 437.
Read more about Alt Code: History and Description, Problems
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