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In page Scientific notation:
"The ALGOL 60 (1960) programming language uses a subscript ten "10" character instead of the letter "E", for example:
6.0221023.[7][8] This presented a challenge for computer systems which did not provide such a character, so ALGOL W (1966) replaced the symbol by a single quote, e.g.6.022'+23,[9] and some Soviet ALGOL variants allowed the use of the Cyrillic letter "ю", e.g.6.022ю+23[citation needed]. Subsequently, the ALGOL 68 programming language provided a choice of characters:E,e,\,⊥, or10.[10] The ALGOL "10" character was included in the Soviet GOST 10859 text encoding (1964), and was added to Unicode 5.2 (2009) as U+23E8 ⏨ DECIMAL EXPONENT SYMBOL.[11]
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