पञ्चहस्तमाणिद्वारम् ॥ कZ_०२.३.२७ ॥
pañcahastamāṇidvāram
The gate (dvāra) should be measured at five hastas (a standardized width/measure for the main entrance).
To standardize construction for security, traffic control, and predictable defensive planning (weapon placement, chokepoint control).