The best replacement for variables is constants.

The best alternatives to variables are rated as following:
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★★★  attributes
★★★  parameters
★★★  dependent variables
★  factors
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★  independent variables
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★  arrays
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Your alternative for variables is not listed? Suggest!
Speaking about variables, one probably shouldn't forget about exponents.

Other search terms related to variables and their ratings are:
★★★★★ exponents
★★★★ negative exponents
★★★★ fractions
★★ fractional exponents
★★ exponents worksheets
★ exponents rules
★ exponents in parentheses
★ sed
★ javascript
exponents calculator
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exponents under radicals
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