십팔공 (十八空)의 하나. 육근 (六根)의 대경( 對境)인 색성향미촉법 (色聲香味觸法)은 실체가 없는 공임을 뜻함

External emptiness: Emptiness of six sense objects (form or mark, sound, smell, taste, touch, and things or being). Cf. (Sippalgong) Eighteen kinds of emptiness.