房

Explanation: https://web.archive.org/web/20170613125616/https://forum.koohii.com/post-14540.html#pid14540 A tassel (房 (#1078) ) is placed at each corner of a sort of "shinto temple" style of roof placed over every sumo ring, pointing at a fixed direction (方 (#490)). 白房 (しろぶさ:white tassel) southwest 黒房 (くろぶさ:black tassel) northwest 赤房 (あかぶさ:red tassel) southeast 青房 (あおぶさ:green tassel) northeast You enter a sumo stadium through the door (戸 (#1076)) and see the 4 房 over the ring.

Source: Kanji Koohii community