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FilledSmallSquareAtomQ[expr] yields True if expr is an expression which cannot be divided into subexpressions, and yields False otherwise.

FilledSmallSquare You can use AtomQ in a recursive procedure to tell when you have reached the bottom of the tree corresponding to an expression.

FilledSmallSquareAtomQ gives True for symbols, numbers, strings and other raw objects.

FilledSmallSquareAtomQ gives True on any object whose subparts cannot be accessed using functions like Map.

FilledSmallSquare See The Mathematica Book: Section 2.3.5.

FilledSmallSquare See also: NumberQ, Head, LeafCount, Length.

Further Examples