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The monadic operator null (<apll>⊙</apll>) is used to aid in resolving ambiguities with slash/slope as a function/operator.

That is, if the parser has trouble with a phrase using slash/slope where you mean that symbol to be a function, but the parser interprets it as an operator, or worse yet signals a <apll>SYNTAX ERROR</apll>, try using the Null operator.

For example, in <apll>L+//R</apll> the interpreter parses the lefthand slash as an operator whose derived function is <apll>+/</apll>.  If you mean that symbol to be a function, use <apll>L+/⊙/R</apll> which forces the lefthand slash to be interpreted as a function.  Alternatively, that line could be written as <apll>L+(//R)</apll>.