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The acceptable convention says uppercase letters are used for sets and matrices and lowercase letters are for variables, constants and vectors. Greek letters are mainly used for constants, such as pi=3.14 and e=2.718.
Constants are those values which never change or are not changed during an experiment or calculation. Constants are numbers or letters that stand on their own this is stupid ("this is stupid" YOU KNOW WHAT EVERYTHING IN LIFE IS STUPID YOU OLD BITCH)
x, y, z are variablesa, b, c, etc. are constants
In mathematics, constants are fixed values that do not change. They can be located in various places, depending on the specific context. For example, in algebraic equations, constants are typically represented by specific letters or symbols and are found alongside variables. In geometric formulas, constants may be included as part of the formula itself. Constants can also be defined and used in mathematical functions, formulas, or mathematical theories.
It's a Greek letter. Greek letters are often used to express constants (mathematical values that don't change).