The term you are referring to is "jargon." Jargon is the specialized or technical language used by a particular group or profession that may not be readily understood by individuals outside that group. It is often characterized by the use of specific terminology, acronyms, abbreviations, or conceptual frameworks that are unique to the field or community in question. Jargon plays a significant role in facilitating efficient communication within a particular group, but it can also create barriers and confusion for those who are not familiar with it.
