I'm assuming that by 'pipe operator' you mean the semantics, not specifically '|'. Of the programming languages I've used F# ('|>', https://camilotk.github.io/fsharp-by-example/chapters/pipe/), Elixir ('|>', https://elixirschool.com/en/lessons/basics/pipe_operator), and Clojure ('->' and '->>', https://clojure.org/guides/threading_macros), have pipe operators. The last two implement them as macros.