IC is a common term for integrated circuits and a hundred other things.
Maybe it’s used for workers in your specific region/field but that’s not definitely universal and it’s not even a useful or descriptive term. Managers are also individuals who ostensibly contribute something to the company. The distinction between managers and workers is that the workers are the people doing the actual work, not that they’re individuals.
IC is a common term for integrated circuits and a hundred other things.
Maybe it’s used for workers in your specific region/field but that’s not definitely universal and it’s not even a useful or descriptive term. Managers are also individuals who ostensibly contribute something to the company. The distinction between managers and workers is that the workers are the people doing the actual work, not that they’re individuals.
No acronym is universal.
You can overload acronyms with dozens of different meanings.
But still, IC is common as individual contributor. Case in point: Microsoft uses it as a filter on their career site. Not exactly a small company…