Multi or Multi 2 diamonds is contract bridge convention whereby the opening bid of 2♦ shows multiple types of hands, which always includes a weak two bid in either major suit, while the additional meaning may be a strong balanced hand (commonly 20-21 high card points), or a 20-22 three suiter. The inherent ambiguity as to both suit and strength makes it a powerful and popular convention capable of seriously disrupting the opponents' bidding.
Although it's technically a brown sticker convention (since no long suit is initially known), its popularity and availability of defenses persuaded World Bridge Federation to allow its usage on tournaments of lesser ratings. It is described in WBF Convention Booklet.
Read more about Multi 2 Diamonds: Description, Defences
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