In contract bridge the minor suits are diamonds (♦) and clubs (♣). They are given that name because contracts made in those suits score less (20 per contracted trick) than contracts made in the major suits (30 per contracted trick), and they rank lower in bidding. In particular, one can make game with a four-level bid in a major suit, while a five-level bid is required in a minor. Of the two minor suits, diamonds rank higher than clubs.
Fundamentally, there are three ways to divide four suits into pairs: by color, by rank and by shape resulting in six possible suit combinations.
For four-color decks, it has been suggested that the red/black distinction could be replaced by pointed bottoms (hearts and diamonds visually have a sharp point downwards, whereas spades and clubs have a blunt stem).