Emperor Xian of Han (181-234), the final Han emperor, set up by Dong Zhuo 董卓, reigned 189-220, forced to abdicate 220 by Cao Pi 曹丕
lit. cut sleeve (idiom); fig. euphemism for homosexuality, originating from History of Western Han 漢書|汉书: emperor Han Aidi (real name Liu Xin) was in bed with his lover Dong Xian, and had to attend a court audience that morning. Not wishing to awaken Dong Xian, who was sleeping with his head resting on the emperor's long robe sleeve, Aidi used a knife to cut off the lower half of his sleeve.
China before to 200 BC
sensible enthalpy (thermodynamics)
energy required to go from one state to another