V-formation

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++

Related topics: Shapes, patterns

V-for·ma·tion /ˈviː fɔːˌmeɪʃən $ -fɔːr-/ noun [countable]  CFif birds or planes fly in a V-formation, they form the shape of the letter V as they fly 〔鸟或飞机成群飞行时的〕V形队形，人字形队列

Examples from the Corpus

V-formation• Highly gregarious, and collectively noisy, they fly fast and direct, but often with rather laboured wing-beats and in V-formation.

V-for·ma·tion nounChineseSyllable  

a in Corpus birds planes if fly or

V-formation
V-for‧ma‧tion /ˈviː fɔːˌmeɪʃən $ -fɔːr-/ noun [countable]
if birds or planes fly in a V-formation, they form the shape of the letter V as they fly