Brihajjataka 12.4

12.4

āsanna kendra bhavana dvayagair gadā ākhyas tanu astageṣu śakaṭaṃ vihagaḥ kha bandhvoḥ/
śṛṅgāṭakaṃ navama pañcama lagna saṃsthair lagna anyagair halam iti pravadanti taj jñāḥ//(vasantatilakā)

When [planets] occupy two adjacent cardinal houses, [the yoga] is called Gadā; when in the ascendant and descendant, Śakaṭa; when in the tenth and fourth, Vihaga;
when in the ninth, fifth, and ascendant, Śṛṅgāṭaka; and when in signs other than the ascendant [forming a trine], the experts declare it to be Hala.