Japanese Mahjong Terms

Akapai 赤牌 Akapai also referred to Akadora Red fives (usually)
Ankan 暗槓 Concealed Kan A concealed, self drawn Kan (Kantsu)
see also Daiminkan
Chankan 搶槓, 槍槓 Robbing a Kan Claiming a tile used by an opponent to extend an open Pon to a Kan for a ron
Chicha 起家 The first dealer in a game.
Chun Chun The red dragon
Daiminkan 大明槓 Open Kan An open Kantsu made by claiming a discard.
Ankan
Dora Hyoujihai ドラ表示 Dora Indicator The open tile in the wanpai that indicats which tile(s) are dora tiles.
Fu Base Points The base points awarded to the winning hand, which is the base of calculating the hand score. see also han
Han 翻/ 飜 Han The score units of a Riichi hand. Used to calculate the score.
see also fu
Haiyama 牌山 Part of the wall where tiles are drawn from in the game.
Hanchan 半荘 A complete game of mahjong consisting of several rounds.
Haneman 跳満 Haneman A Limit hand worth 18000 for oya (親, the dealer) and 12000 for the ko (子, non-dealer) .
Haku  白 Haku The white dragon
Hatsu Hatsu The green dragon
Ippatsu 一発] One shot When a player declares riichi and does ron/tsumo within the first go-around. A go-around can be interrupted if a player declares a chow, pung, or (concealed or melded) kong.
Kan A special combination of four identical tiles.
see also Daiminkan,
Kazehai 風牌 Wind Tiles The four wind tiles: East, South, West and North.
See also : East (Ton,東), North (Pei, 北)South (Na, 南), West (Sha,西)
Kiru 切る Cut The Japanese use the term Kiru for discard. Thus the term is also sometimes used in English as well (cut a tile)
Ko Child The non oya (dealer) player/s.
Mangan 満貫 Mangan Limit hand scoring 12000 or 8000 (dealer/non-dealer). Depening on if the winner is Oya
(dealer) or Ko (non-dealer).
Menzen 門前 Concealed hand A completely concealed (closed) hand.
Na South South, The South tile. See also : East (Ton,東), West (Sha,西), North (Pei,北)
Nancha 南家 The second dealer in a game
Nagashi Mangan 流し満貫 A special hand in Japanese Mahjong. A Nagashi Mangan is a concealed hand (not necessarily in Tenpai), when game ends in a draw. The players discards are solely composed of terminal or honor tiles of which non have been claimed by a opponent.
Oya Parent The dealer, sitting east
Pei North The north tile. See also : East (Ton,東), South (Na, 南), West (Sha,西)
Peicha 北家 The fourth dealer in a game.
Renho 人和 Blessing of Man Player goes out on a discard in the first go around. Hand must be concealed.
Rinshan Kaihou 嶺上開花 Winning by replacement of a Kan. Rinshan Kaihou is worth on yaku.
Ron ロン Ron Winning by claiming someone elses discarded tile. See also Tsumo (自摸)
sangenpai 三元牌 3 element tiles The three dragons as they are referred to in English
See also : White Dragon (Haku 白), Green Dragon (Hatsu 發), Red Dragon (Chun 中)
Sha 西 West The west tile. See also : East (Ton,東), South (Na, 南), North (Pei,北)
Shacha 西家 The third dealer
Shanten 向聴 Number of tiles needed to reach Tenpai.
Shimocha 下家 The player sitting to your right who acts after you
Tenpai 聴牌 Ready A hand that is a single tile from being completed. If you have declared Riichi. Then you are always in Tenpai
Tsumo 自摸 Tsumo The tile that has just been drawn from the wall. See also Ron (ロン)
TsumoKiri ツモ切り Tsumo Discarding the tile that has just been drawn from the wall (Yama, 山) The tile that has just been drawn from the wall. See also Tsumo (自摸)
Ton East East, The East tile. See also : South (Na, 南), West (Sha,西), North (Pei,北)
Wanpai 王牌 The Kings tiles The dead wall. Part of the yama from which no tiles are drawn. This part is only used for the dora indicators.
Yakuman 役満 Yakuman The most rare hand patterns. A Yakuman scores 4 times a Mangan, which is 48000 or 32000 depending if you are
Oya (dealer) or Ko (non-dealer).
Yama Mountain Literary meaning wall, yama is the part of the wall from which the tiles are drawn from. See also Haiyama (牌山)