`Command \ Set`(missing documentation)`Function \ Set`(missing documentation)- Function \ Ideal, see Ideal / Function -- apply a function to generators of an ideal
- Command \ VirtualTally, see VisibleList / Function -- apply a function to elements of a list
- Command \ VisibleList, see VisibleList / Function -- apply a function to elements of a list
- Function \ VirtualTally, see VisibleList / Function -- apply a function to elements of a list
- Function \ VisibleList, see VisibleList / Function -- apply a function to elements of a list
- RingMap \ List, see VisibleList / Function -- apply a function to elements of a list
- SelfInitializingType \ VisibleList, see VisibleList / Function -- apply a function to elements of a list

This operator may be used as a binary operator in an expression like `x\y`. The user may install binary methods for handling such expressions with code such as

X \ Y := (x,y) -> ...

where `X` is the class of `x` and `Y` is the class of `y`.