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 constant like "c" equals the speed of light in E=mc2
Representing a number in decimal form does not change its value. Its value remains at 79 however it it written.
The symbol that represents change is delta. (It looks like a little triangle before the unit) ..../\..... ../....\..... /____\....
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
The symbol for representing the period of a wave is the greek letter lambda (λ).