黄帝内经
The title "Huangdi Yinfujing" combines three Chinese words. The first "Huangdi" 黃帝 "Yellow Emperor" and last "jing" "classic; scripture; book" are common in titles of other Chinese classic texts. For example, the "Huangdi Neijing" "Yellow Emperor's Inner Classic" and "Huangdi Sijing" "Yellow Emperor's Four Classics". The second word "yinfu" "hidden/secret talisman/correspondence" is an uncommon compound of "yin" (of "yin and yang") "shady place; passive; negative; secret; hidden" and "fu" " tally (with two halves); talisman; symbol; charm; amulet".