Source: Wikipedia

Brozel is a contract bridge bidding convention used to intervene after an opposing one notrump (1NT) opening bid. It features the following calls:

• Double – shows any single suit; advancer bids 2, after which intervenor corrects to his actual suit (or passes with clubs). This was originally played as requiring either a solid suit or a very good suit and an entry, leaving advancer the opportunity to pass with a couple of side-suit stoppers, though many partnerships now allow a weaker suit.
• 2– shows clubs and hearts
• 2 – shows diamonds and hearts
• 2 – shows hearts and spades
• 2 – shows spades and an unspecified minor suit
• 2NT – shows clubs and diamonds

The convention is named loosely after its creator, Bernard Zeller.