प्राकारसमं मुखमवस्थाप्य त्रिभागगोधामुखं गोपुरं कारयेत् ॥ कZ_०२.३.३१ ॥
prākārasamaṃ mukhamavasthāpya tribhāgagodhāmukhaṃ gopuraṃ kārayet
Having set the gateway-front level with the rampart (prākāra-sama), one should construct a gatehouse (gopura) whose ‘iguana-faced’ projection (godhāmukha) extends by one-third (tribhāga).
A projection improves lateral coverage and flanking fire onto attackers at the gate, reducing blind spots.