In the simplest case, the list of symbols containing the given string is returned.
i1 : apropos "atrix"
o1 = {ChangeMatrix, compactMatrixForm, diagonalMatrix, fillMatrix,
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genericMatrix, genericSkewMatrix, genericSymmetricMatrix,
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getChangeMatrix, Matrix, matrix, MatrixDegreeExpression,
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MatrixExpression, MinimalMatrix, MutableMatrix, mutableMatrix,
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randomMutableMatrix, submatrix, submatrix', submatrixByDegrees,
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sylvesterMatrix, SyzygyMatrix}
o1 : List
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Regular expressions allow for more complicated requests. For example, to find all functions that start with mat or Mat:
i2 : apropos "^[mM]at"
o2 = {match, mathML, Matrix, matrix, MatrixDegreeExpression,
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MatrixExpression}
o2 : List
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The object apropos is a method function.