6.022e23

The character # is often used to prefix extensions to the syntax, e.g. #x10 for hexadecimal integers, or #\C for characters.

Uses

Use in Lisp

When representing source code in Lisp, the first element of an S-expression is commonly an operator or function name and any remaining elements are treated as arguments. This is called "prefix notation" or "Polish notation". As an example, the Boolean

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