In older game descriptions, diamonds are often referred to as "corner stones". In Switzerland the color is still called "Egge" ( corner ). The term "Karo" came into the German language in the 18th century via the French carreau and goes back to the Latin quadrum "Viereck, Quadrat".
- Character encoding
|character||Unicode||Entity in HTML|
|♦||U + 2666 BLACK DIAMOND SUIT||
|♢||U + 2662 WHITE DIAMOND SUIT||
- Wolfgang Pfeifer: Etymological Dictionary of German. 8th edition. Deutscher Taschenbuch Verlag, Munich 2005, ISBN 3-423-32511-9 .