Hi,
These are some of the abbreviations of the categories
Ur is un reserved
O is open category
S is sainik
X is nil category
Ncc is national cadet corps
H is physically handicapped
N is not eligible
Y is eligible
Ts is technical stream and
Ff is freedom fighter

Hi,
These are some of the observations of the categories
Ur is un reserved
O is open category
S is sainik
X is nil category
Ncc is national cadet corps
H is physically handicapped
N is not eligible
Y is eligible
Ts is technical stream and
Ff is freedom fighter

UR is the abbreviation used for Unregistered/General

OP(open) is also another abbreviation used for Unregistered/General

This one I am not too sure about but maybe it is-

H is the abbreviation used for Scheduled tribe of Himachal Pradesh