If you have any additions to the listing below, I would be very glad to receive them - email Julian Carosi.

Listed below are common acronyms and abbreviations used in the world of soccer/football Refereeing. 

This is not an extensive listing, and additions are most welcome.

OFF = Would you please mind leaving the field of play!

APO = Advantage Play On

AR = Assistant Referee

AR1 = Assistant Referee 1

AR2 = Assistant Referee 2

CA = Corner Arc

CC = Centre Circle

CF = Corner Flagpost

CK = Corner Kick

CL = Club Linesman

CM = Centre Mark

CR = Centre Referee

CRUEF = Careless Reckless Using Excessive Force

DB = Dropped Ball

DFK = Direct Free Kick

DOGSO = Denying Obvious Goal Scoring Opportunity

DR = Delays the Restart (of play)

ETFOP = Entering The Field Of Play

FAMOA = Football Association Match Officials Association

FC = Football Club

FIFA = Federation Internationale de Football Association

FK = Free Kick

FO = Fourth Official

FOP = Field Of play

FRD = Failure to Respect (required) Distance

FT = Full Time

GA = Goal Area

GK = Goal Keeper

GK = Goal Kick

GL = Goal Line

HL = Halfway Line

HT = Half Time

IFAB = International Football Association Board

IFK = Indirect Free Kick

IMHO = In My Honest Opinion

INDFK = Indirect Free Kick

ITOOTR = In The Opinion Of The Referee

K = Keeper (Goalkeeper)

KO = Kick off

LOAF = Laws Of Associated Football

OFFINABUS = OFFensive INsulting or ABUsive language and/or gestures

OGSO = Obvious Goal Scoring Opportunity

OS = OffSide

OSP = OffSide Position

PA = Penalty Area

PA = Penalty Arc

PI = Persistent Infringements

PK = Penalty Kick

PM = Penalty Mark

RA = Referees' Association

RC = Red Card

SFP = Serious Foul Play

SO = Send Off

SOTG = Spirit Of The Game

SOTL = Spirit Of The Law

TA = Technical Area

TI = Throw-In

TL = Touch Line

USB = UnSporting Behaviour

VC = Violent Conduct

WOTRP = WithOut the Referee's Permission

YC = Yellow Card

YHTBT = You Had To Be There

2C = Second Caution