Acronyms - abbreviations related to football

FIFA - Fédération Internationale de Football Association
UEFA - Union of European Football Associations

Positions:

GK - Goalkeeper
LB - Left Back
RB - Right Back
CB - Centre Back
LWB - Left Wing Back
RWB - Right Wing Back
DM - Defensive Midfield
CM - Centre Midfield
RM - Right Midfield
LM - Left Midfield
AM - Attacking Midfield
CF - Centre Forward
RF - Right Rorward (Winger)
LF - Left Forward (Winger)

Others:
LFP - Liga de Futbol Profesional (as shown on the right sleeve of the Spanish Premiera Clubs)
BBVA - Banco Bilbao Vizcaya Argentaria  (It represents a banking group that belongs to Spain)
BPL - Barclays Premier League
Sub - Substition
SF - Semi=final
QF - Quarter-final
PK - Penalty Kick
OG - Own Goal
HT - Half Time
FT - Full Time
ET - Extra Time
AFC - Asian Football Confederation 
CAF - Confédération Africaine de Football in Africa
CONCACAF - Confederation of North, Central American and Caribbean Association Football
CONMEBOL - Confederación Sudamericana de Fútbol 
OFC - Oceania Football Confederation
MLS - Major League Soccer