Brihat Parashara Hora Shastra
लग्नात् पंचमभाग्यस्य कोणसंज्ञा विधीयते। षष्ठाष्टव्ययभाबानां दुःसंज्ञास्त्रिकसंज्ञकाः॥ ३५॥
Putr and Dharm Bhava are known by the name Kon (or trine). Evil Bhavas, or Dusthan Bhavas are Ari, Randhr and Vyaya Bhava.
english translation
lagnAt paMcamabhAgyasya koNasaMjJA vidhIyate। SaSThASTavyayabhAbAnAM duHsaMjJAstrikasaMjJakAH॥ 35॥
hk transliteration by Sanscript