Simplified form of 參. Depicts three (三) stars (晶) shining (光). Originally represented the Three Stars constellation (參) in Chinese astronomy. The more common meaning "take part in" is a phonetic loan.
take part in, intervene; ginseng; to take part in; to participate; to join; to attend; to counsel; unequal; varied; irregular; uneven; not uniform; abbr. for 參議院|参议院 Senate, Upper House