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For example, abbreviating <math>D = \{ \langle 0 \rangle, \langle 1 \rangle, \langle 2 \rangle, \langle 3 \rangle, \langle 4 \rangle, \langle 5 \rangle, \langle 6 \rangle, \langle 7 \rangle, \langle 8 \rangle, \langle 9 \rangle \}</math>, the set of all three-digit decimal numbers is obtained as <math>D \cdot D \cdot D</math>. The set of all decimal numbers of arbitrary length is an example for an infinite language.
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The '''alphabet of a string''' is the set of all of the characters that occur in a particular string. If ''s'' is a string, its [[alphabet (computer science)|alphabet]] is denoted by
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