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Reference.org
List of letters used in mathematics, science, and engineering
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<p><a href="/facts/Latin_letters/7EWeJjUV">Latin</a> and <a href="/facts/Greek_letters/1cHwB8Dg">Greek letters</a> are used in <a href="/facts/Mathematics/pxTouaz4">mathematics</a>, <a href="/facts/Science/IJoaD7rs">science</a>, <a href="/facts/Engineering/RFVg8H3I">engineering</a>, and other areas where mathematical notation is used as symbols for <a href="/facts/Mathematical_constant/rzqTX307">constants</a>, <a href="/facts/Special_function/JETSeucA">special functions</a>, and also conventionally for <a href="/facts/Variable_(mathematics)/VbQlrvKz">variables</a> representing certain quantities. </p>