The International Olympic Committee (IOC) uses three letter
acronym country codes to refer to each group of athletes that
participate in the Olympic Games. Each code usually identifies a
National Olympic Committee, but there are several codes that have
been used for other instances in past Games, such as teams composed
of athletes from multiple nations, or groups of athletes not
formally representing any nation.
Several of the IOC codes are different from the standard ISO
3166-1 alpha-3 codes. Other sporting organizations, such as FIFA or
the Commonwealth Games Federation, use similar country codes to
refer to their respective teams.