:: a -> (a -> b) -> b package:diagrams-lib

(&) :: a -> (a -> b) -> b
diagrams-lib Diagrams.Prelude
& is a reverse application operator. This provides notational convenience. Its precedence is one higher than that of the forward application operator $, which allows & to be nested in $. 
>>> 5 & (+1) & show
"6"
( # ) :: a -> (a -> b) -> b
diagrams-lib Diagrams.Util
Postfix function application, for conveniently applying attributes. Unlike ($), (#) has a high precedence (8), so d # foo # bar can be combined with other things using operators like (|||) or (<>) without needing parentheses.