Another language that supported this was Northern Telecom's PROTEL (https://en.wikipedia.org/wiki/Protel https://en.wikipedia.org/wiki/Protel) from the 1980s.

Another language that supported this was Northern Telecom's PROTEL (https://en.wikipedia.org/wiki/Protel https://en.wikipedia.org/wiki/Protel) from the 1980s. The operator is written "->" and is informally called a "gazinta" ("goes into").