Exact(2)
The term probably came from the internal lingo at Facebook, but it has spread widely among technology companies.
Common mistakes include not labeling both axes of a chart, using internal lingo that may not mean anything outside your organization, and making false assumptions about your client's level of understanding.
Similar(6)
You can use internal jargon with impunity with colleagues–"internal customers"–and be confident that they'll understand what you're talking about and not be put off by the company lingo.
Lingo came from our internal research.
His wife, meanwhile, recently sent an internal e-mail message to State Department employees referring to herself as an "MOTB" — wedding planner lingo for mother of the bride.
Lingo, Elizabeth Long, Colin Fisher, and Kathleen L. McGinn.
Question their lingo.
She knows the lingo.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com