Welp reading wikipedia i just learned The gesture is used by doctors to test functionality of the anterior interosseous nerve and seek indications of median nerve palsy in the hands. When performing the test, a patient makes the OK gesture with both hands. If the circle formed by one hand appears more pinched or less round than the other, it may indicate weakness in the nerve.
A similar medical test, known as Froment’s sign, is used to test for palsy on the ulnar nerve. To perform the test, a patient holds a piece of paper between their forefinger and thumb, and the examiner attempts to pull it out of the patient’s grip. If ulnar nerve palsy is present, the patient will have difficulty maintaining their hold and may compensate by flexing the thumb to add more pressure.
Apparently an Indian Company uses it in their logo https://en.wikipedia.org/wiki/Piramal_Group
Can read if you want https://en.wikipedia.org/wiki/OK_gesture There are so many different meanings and uses.