Football fans will be very familiar with the sight of red and yellow cards that have been a staple of the game since the 1970 World Cup in Mexico.
But what may be a more unfamiliar sight to those who regularly watch the sport is that of a white card.
Initially used in a women's cup clash between Sporting Lisbon and Benfica it's second use was also in Portugal but this time in the fifth division.
And while the two cards most seen are used by referees to punish players, this new third card is used for something quite different.