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Because the number of symbols (or glyphs) used in common natural languages as well as in mathematics (· × ÷ ≠ ≥ ≈ π etc.) and many programming languages and technical applications far exceeds the 96 (128-32) printable ASCII codes, many extensions to it have been used. While remaining in full use today, it would be regarded as a topic in the mathematics of Hilbert space, although, technically speaking, it is somewhat more general in scope. While the terminology is reminiscent of rotations of vectors in ordinary space, the Hilbert space of a quantum object is more general, and holds its entire quantum state.


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