अरत्निरिन्द्रकीलः ॥ कZ_०२.३.२६ ॥
aratnirindrakīlaḥ
इन्द्रकील (खूँटी/लॉकिंग पिन) एक अरत्नि (एक बाँह-लंबाई) का होना चाहिए।
It prevents under-building (cost-cutting that weakens security/stability) and makes compliance measurable during inspection.