ᱪᱷᱟᱸᱪ:Mvar/doc
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The mvar template makes the argument italic and formats as mathematics. It is used to refer to individual variables in normal running text. It should not be used within a {{math}} template.
Note that digits in a variable name are conventionally not italic so {{math}} should be used instead in for example {{math|''x''<sub>1</sub>}} to produce x1. Functions and variables made up of multiple letters are conventionally set in upright letters so {{math}} should be used in that case too; for example {{math|cos}} to produce cos.