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User Symbols

A User Symbol, denoted by a $ prefix to an alphanumeric name, is a variable known to the input parser. A symbol, once defined, may be used anywhere in the input is place of a number. A new symbol may be constructed from existing symbols, numbers, and the operators + - * / Symbol Names are case-sensitive, and must be 10 characters or less.

$abc Prints value of $abc
$edf = 1.1 Sets $edf to 1.1
$xyz = $ijk + $nmo  
$ Lists all symbols
sphere 2 $aa $ab $ac $r1 Use of symbols in command

Symbols may NOT be repeated: sphere 3 3*$cc 4 is not allowed.

In-line symbol arithmetic is NOT allowed: sphere 4 3*0 $a+$b-$c