大七星

大(ダイ)七(チー)星(シン) or 大(だい)七(しち)星(せい) or 大(だい)七(ち)星(せい) • (daichīshin or daishichisei or daichisei) 

1. (mahjong) a local double 役(やく)満(まん) (yakuman, “limit”) found in some rulesets, formed by seven pairs of all honor tiles; a combination of 字(ツー)一(イー)色(ソー) (tsūīsō, “all honors”) and 七(チー)対(トイ)子(ツ) (chītoitsu, “seven pairs”).