The full form of I-R-O is International  Recognized Organisations  It is a code that acts as an 

identification for individual Fitness Trainers, especially those who certified from only 

International Recognized Organization or Institute. It is a unique, 10-character 

alpha-numeric identifier, issued to all judicial entities identifiable under the CBFETR.

Structure and provisions:

The I-R-O structure is as follows: Country-State-Serial Code-Training Category. 

Example:

United States of America - USFL00001A

United Kingdom               - UKEN00001Z

Chna                                - CNBJ00001F

India                                -  INDL00001Y: 

First four characters are letters, next five characters are numerals, last character is letter.

The first four are sequence of alphabets from AAAA to ZZZZ

Next five character informs about the Serial Code.

Last one character is Training Category.

Each Instructor is uniquely defined as below:

Y - Yoga                         001                                                                          A - Aerobics                       002

Z - Zumba                      003                                                                         F - Gym/Fitness                 004