Natyashastra
करणानां समायोगः खण्डमित्यभिधीयते । खण्डैस्त्रिभिश्चतुर्भिर्वा संयुक्तं मण्डलं भवेत् ॥ ४॥
Khaṇḍa: A combination of the ॥ three॥ Karaṇas is called the Khaṇḍa. Maṇḍala: Three or four Khaṇḍas combine to make up the Maṇḍala.
english translation
karaNAnAM samAyogaH khaNDamityabhidhIyate । khaNDaistribhizcaturbhirvA saMyuktaM maNDalaM bhavet ॥ 4॥
hk transliteration by Sanscript