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I assume you are talking about constant values in expressions. Any letter (including Greek ones) can be used to represent a constatnt, but the most common one is k.
There are, however, some constants which are associated with other symbols:
Ratio of circumference of circle to diameter = pi
Speed of light in vacuum: c
Gravitational attraction: G (not to be confused with g, in the context of the earth's gravity)
Avogardo's constant: NA
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A symbol representing a value that does not change?
A constant like "c" equals the speed of light in E=mc2
What is the decimal value of 79?
Representing a number in decimal form does not change its value. Its value remains at 79 however it it written.
What symbol is to represent the change in value?
The symbol that represents change is delta. (It looks like a little triangle before the unit) ..../\..... ../....\..... /____\....
How do explain to someone what a number is?
an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification
What is the mathematical symbol used for the waves period?
The symbol for representing the period of a wave is the greek letter lambda (λ).
