There are seven on field officials for a College Football game:
R - Referee
U - Umpire
H - Head Linesman
L - Line Judge
S - Side Judge
B - Back Judge
F - Field Judge
Click on the 'Duties of Football Officials' link on this page to read about what responsibilities each of the officials in an American football game has.
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The letters indicate what 'type' of official they are: R - Referee
U - Umpire
HL - Head Linesman
LJ - Line Judge
SJ - Side Judge
FJ - Field Judge
BJ - Back Judge Click on the 'Officials Duties' link below to read about what duties each official has in the game.
The referee(R)
The umpire(U)
The head linesman (H or HL)
The line judge (L or LJ)
The field judge (F or FJ)
The side judge (S or SJ)
The back judge (B or BJ)
So you can easily identify each ref. They also have a letter on the back of their shirt to indicate their position.
It represents their position on the field and what area(s) they are responsible for:
Umpire
Head Linesman
Line Judge
Field Judge
Side Judge
Back Judge
It means he cannot "c" (see) which is probably why most of his calls are going to be absolute garbage.