(Japanese mythology, Shinto) Yamata no Orochi, a legendary dragon that was slain by Susanoo

a octadecagon

nothing but lies; full of lies

(military, historical) Eighth Route Army

twenty-eight; 28

(linguistics) the theory that Old Japanese had eight vowels: /a/, /i₁/, /i₂/, /u/, /e₁/, /e₂/, /o/.

thirty-eight; 38

(historical, dance) bayi: an ancient Chinese dance, originally presented to emperors during sacrificial rites, performed by 64 people (in 8 groups of 8) accompanied to 雅楽 (gagaku, “yayue”) music

eating until one is eight parts (out of ten) full

(martial arts) Bajiquan