Originally designed as an icon alternative for shogi kanji pieces, soon extended for chu-shogi (covering chess) and cannon-shogi.
Chess https://lichess.org/
Style: https://userstyles.world/style/18241/firi-pieceset-lishogi
Cannon-shogi https://www.pychess.org/variants/cannonshogi
Style: https://userstyles.world/style/18393/firi-pieceset-cannonshogi
Chushogi https://lishogi.org/variant/chushogi
Style: https://userstyles.world/style/18471/firi-pieceset-chushogi-lishogi
Some pieces are inspired (most started out as tracings) of the 'International - black and white' chushogi set.
https://www.pychess.org/variants/mansindam
https://www.pychess.org/variants/shogun
https://www.pychess.org/variants/empire
https://www.pychess.org/variants/orda
https://www.pychess.org/variants/shinobiplus