stegs bu

སྟེགས་བུ
rest, support, turret, shelf or box on which birds perch, altar, raised seat [JV]

on the ledge by the gateways; (Skt. vedi) [RY]

1) supporting stand/ platform [tier], board, stool; 2) ledge by the gateway in divine palace [where the offering deities are] tier; 3) [practice] table; 4) shrine; 5) lifted, supported [p steg; 5) steps on a ladder [IW]

a cross-bar; support, stand, [practice] table, shrine; on the ledge [by the gateways]; (Skt. vedi) [RY]