Johann ******************
@Chan ***
Non Immigrant categories as far as I know;
Non B - work/business visa
Non ED - Educational visa
Non O - Retirement visa (OA/OX/O)
Non O - Based on marriage to Thai National
Non O - Dependent visa of foreigners who hold Non B Visa i.e., spouse and children.
That as far as I know are under Non- Immigrant, feel free to correct if I understood it wrong.