CLHS: Section 2.3.1.1.2

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## 2.3.1.1.2 Examples of Potential Numbers

As examples, the tokens in the next figure are potential numbers, but they are not actually numbers, and so are reserved tokens; a conforming implementation is permitted, but not required, to define their meaning.

    1b5000                       777777q                1.7J  -3/4+6.7J  12/25/83
    27^19                        3^4/5                  6//7  3.1.2.6    ^-43^
    3.141_592_653_589_793_238_4  -3.7+2.6i-6.17j+19.6k

Figure 2-10. Examples of reserved tokens

The tokens in the next figure are not potential numbers; they are always treated as symbols:

    /     /5     +  1+  1-
    foo+  ab.cd  _  ^   ^/-

Figure 2-11. Examples of symbols

The tokens in the next figure are potential numbers if the current input base is `16`, but they are always treated as symbols if the current input base is `10`.

    bad-face  25-dec-83  a/b  fad_cafe  f^

Figure 2-12. Examples of symbols or potential numbers

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