त्रयाणामर्धचन्द्रकः कर्कटकशृङ्गी वा ॥ कZ_१०.६.३७ ॥
trayāṇām ardhacandrakaḥ karkaṭakaśṛṅgī vā
Für eine Formation aus drei Abteilungen wird als Aufstellung entweder der «Halbmond» (ardhacandraka) oder das «Krabbenhorn» (karkaṭakaśṛṅgī) empfohlen.
Both emphasize controlled curvature/envelopment: with only three divisions, curved or pincer-like fronts help protect flanks and concentrate pressure without requiring many sub-units.