& sigil alias for all 'and' operations and overloaded operators

1 & 1 == 1 and 1 == true

inverse function composition

natural for beginners but unfamiliar for long time programmers square & print 2 == print(square(2))

& sigil for function pointers

map &square [1 2 3] == [1 4 9]

Note that due to automatic broadcasting explicitly using map and pointers should rarely be needed.