 According to Taittiriya Samhita 5.2.3., they are made of twenty-one bricks.In ŚBM 10.4.3.14-20, the altar is made of 396 (360 + 36) yajusmati (special) bricks, and of 10,800 lokamprna (ordinary) bricks.10,701 lokamprna bricks belong to the ahavaniya altar, 78 to the dhisnya hearths and 21 to the garhapatya.