Each maneuver battalion in a division received a number (the "tens" digit), and each company received a number (the "ones" digit). So battalion numbers would be 10, 20, 30, 40...90. Individual company numbers in each battalion would be 0, 1, 2, 3, 4, 5 (HHC, A, B, C, D, E).
So a HQs tank or Bradley could be 10, 20, 30, etc.
An A company vehicle would be 11, 21, 31, etc. B Co would be 12, 22, 32, etc.
His "92" would mean the 9th battalion of that division, B Company. His actual battalion could be 1-33 AR, 4-34 AR, or whatever unit designation it really was. The concept was to give divisional unit leaders the ability to quickly identify the unit without making it too easy for the enemy to make the same indentification.
The dot for platoon thing Pete talks about was a 24th ID thing. 1st Cav and 2nd AD in the states had similar unique marking methods. The 2 digit system was developed for USAREUR (United States Army Europe) based units and was just carried over to use in the Gulf since the European-based US VII Corps took over operational control of the heavy divisions in theater. CONUS based divisions just brought the marking system back to the states with them.