surname Jiao

burnt; scorched; charred; worried; anxious; coke; joule (abbr. for 焦耳[jiao1 er3])

to burn (food by overroasting etc)

to focus (light, electron beam etc); to focus attention

(TCM) the three truncal cavities (thoracic, abdominal and pelvic), known as the "triple heater" or "San Jiao"