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In page Number sign:

"

On telephones, the International Telecommunication Union specification ITU-T E.161 3.2.2 states: "The symbol may be referred to as the square or the most commonly used equivalent term in other languages."[1] Formally, this is not a number sign but rather another character, U+2317 VIEWDATA SQUARE. The real or virtual keypads on almost all modern telephones use the simple # instead, as does most documentation.[citation needed]