空Sky. Atmosphere. Heaven. Big. Wide. Empty. No substance. Meaningless. Useless. In Buddhism, something without substance or essence. A thing related to aviation.
公Public. Matters concerning the country or government. Government, state, office. To be known by many people. Obvious. Something ostensible. Unbiased. Correct. Neutral. A person of high status, such as a son, emperor, or monarch.
明Bright. The state of being illuminated by light and seeing clearly. A hopeful and positive attitude. A detailed understanding of things. To be clear. To distinguish. Smart. Wise. Light. To light up.
義Righteousness. The path that one should take as a human being. Meaning. Main idea. A kinship relationship formed by persons who are not related by blood. Instead of the real thing.