Set of Symbols
A set of symbols is the reservoir of symbols for the contents. This set contains the total amount of different symbols that may be used.
If a symbol will be represented by a byte, the entire set contains 256 different symbols. This corresponds to the number of symbols addressable by a byte (0 to 255). A common character set according to ASCII or ANSI consists of 256 different symbols or characters respectively.
Examples for common sets of symbols:
small letters
{a, b, c, d, e, f, g, ... z}
deoxyribonucleic acid (DNA)
{A, C, G, T}
Adenin, Cytosin, Guanin, Thymin
boolean expressions
{0, 1}
{false, true}
The number of symbols used from the set and the probability of their usage will be decisive for the success of a compression procedure.
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