A player is "capped" for each international match played. Some "friendly" games also count. A player who has played in 50 international matches has fifty caps.
The origin
It stems from the old days when the players were issued commemorative "caps" for the game; the term has simply continued, although the actual caps are no longer provided to the players.
See related link, "International cap", for a photo of a cap.
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The number of caps a player has, represents how many times they have played for their country internationaly.
A cap is a reference to [ or a nickname for ] an international game played. Therefore the number of caps is simply the number of international games played.
You get a cap when you play for your National team. David Beckham got 100 caps because he played 100 games for England.
Cap casualty means someone who is still under contract with the team that is going to get cut to make room for a different player to take his spot
"Caps" is the number of International Matches a player has played in for their country.