Taijitu the Tibetan designs have three or four swirls (representing the Three Jewels or the Four Noble Truths, i.e. as a triskele and a tetraskelion design), Lai Zhide's taijitu has two swirls, terminating in a central circle. The Ming-era design of the taijitu of two interlocking spirals has been reported as "yin-yang symbol" in the first half of the 20th century. The flag of South Korea, originally introduced as the flag of Joseon era Korea in 1882, shows this symbol in red and blue. This was a modernisation of the older (early 19th century) form of the Bat Quai Do used
Yin and yang Proto-Viet-Muong "hlaŋ"); owing to "the different OC initial consonant which seems to have no recognizable OC morphological function". "Yin" and "yang" are semantically complex words. A reliable Chinese-English dictionary gives the following translation equivalents. Yin 陰 or 阴 Noun ① [philosophy] negative/passive/female principle in nature ② Surname Bound morpheme ① the moon ② shaded orientation ③ covert; concealed; hidden ④ ⑦ negative ⑧ north side of a hill ⑨ south bank of a river ⑩ reverse side of a stele ⑪in intaglio Stative verb ① overcast Yang 陽 or 阳 Bound morpheme ① [Chinese philosophy] positive/active/male principle in nature ②the