As examples, the tokens in Figure 2--10 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 Figure 2--11 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 Figure 2--12 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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