homa-mandala; fire altar
A Buddhist ritual platform used for goma (homa) fire offerings, especially in esoteric traditions.
See also: 護摩
A fire was lit on the goma altar and prayers were offered.
Compound of 護摩 (goma, 'homa fire ritual') and 壇 (dan, 'platform, altar'). The term is specific to esoteric Buddhism.