非空

fēikōng
(math.) (of a set) non-empty; (computing) (of a data structure) non-empty

CEDICT

math computing

Entry Composition

1 非 fēi
  1. to not be; not
  2. wrong; incorrect
  3. non-; un-; in-; de-
  4. to reproach; to blame
  5. (coll.) to insist on; simply must
2 空 kōng
  1. empty
  2. air
  3. sky
  4. in vain