Here is the history of the |> symbol as best as I can tell: 1994: Isabelle/ML (part of Isabelle proof assistant tooling) (https://blogs.msdn.microsoft.com/dsym

Here is the history of the |> symbol as best as I can tell: 1994: Isabelle/ML (part of Isabelle proof assistant tooling) (https://blogs.msdn.microsoft.com/dsyme/2011/05/17/archeological-semiotics-the-birth-of-the-pipeline-symbol-1994/ https://blogs.msdn.microsoft.com/dsyme/2011/05/17/archeologi...) 2005 and earlier: F# 2012: Elm 2013: Elixir (https://github.com/elixir-lang/elixir/pull/751 https://github.com/elixir-lang/elixir/pull/751) 2013: OCaml (https://ocaml.org/releases/4.01.0.html https://ocaml.org/releases/4.01.0.html)