# Origin of $\mapsto$ notation

Who invented the brilliant $\mapsto$ notation for describing a function's action on a point, as in $x \mapsto x^2$?

This is in some sense a counterpart to Who came up with the arrow notation $x \rightarrow y$?

-
It could have only been this guy – Mike F Jul 26 '13 at 1:53
And further, why do both it and lambda expressions exist? – James Wood Jul 18 '14 at 12:11
I guess it was Bourbaki but I can't find a reference right now. – lhf Dec 14 '15 at 18:16