《南村輟耕錄》 explains the origin of the term as follows:

若曰人身之中半，則當在臍腹間。蓋自此而上，眼耳鼻皆雙竅；自此而下，口暨二便皆單竅。三畫陰，三畫陽，成泰卦也。[Classical Chinese,trad.]

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若曰人身之中半，则当在脐腹间。盖自此而上，眼耳鼻皆双窍；自此而下，口暨二便皆单窍。三画阴，三画阳，成泰卦也。[Classical Chinese,simp.]

Ruò yuē rénshēn zhī zhōngbàn, zé dāng zài qí fù jiān. Gài zì cǐ ér shàng, yǎn ěr bí jiē shuāng qiào; zì cǐ ér xià, kǒu jì èrbiàn jiē dān qiào. Sān huà yīn, sān huà yáng, chéng tài guà yě.[Pinyin]

If one refers to the middle of the body, it must be around the navel and the abdomen. For going up from here [the philtrum], the eyes, ears, and nose all have two orifices; going down from here, the mouth and the two [organs of] excretion all have single orifices. Three strokes ofyin and three strokes ofyang make the Peace hexagram.

人中

1. (anatomy, physiology)philtrum

(Thisetymology is missing or incomplete. Please add to it, or discuss it at theEtymology scriptorium.)

• (Tokyo)ひとなか[hìtónáká] (Heiban – [0])
• IPA^(key): [çito̞na̠ka̠]

人(ひと)中(なか)• (hitonaka) 

1. society,company
2. thepublic, theworld

(Thisetymology is missing or incomplete. Please add to it, or discuss it at theEtymology scriptorium.)

• (Tokyo)じんちゅう[jíꜜǹchùù] (Atamadaka – [1])
• (Tokyo)じんちゅう[jìńchúú] (Heiban – [0])
• IPA^(key): [d͡ʑĩɲ̟t͡ɕɨː]

人(じん)中(ちゅう)• (jinchū) 

1. incompany, amongpeople
2. (anatomy, physiology)philtrum

(Thisetymology is missing or incomplete. Please add to it, or discuss it at theEtymology scriptorium.)

• (Tokyo)にんちゅう[níꜜǹchùù] (Atamadaka – [1])
• (Tokyo)にんちゅう[nìńchúú] (Heiban – [0])
• IPA^(key): [ɲ̟ĩɲ̟t͡ɕɨː]

人(にん)中(ちゅう)• (ninchū) 

1. the human world

• “人中”, in漢字ぺディア [Kanjipedia]‎^[1] (in Japanese),The Japan Kanji Aptitude Testing Foundation,2015–2025

人中• (injung) (hangeul인중)

1. hanja form^? of인중(“philtrum”)

人中

1. chữ Hán form ofnhân trung(“philtrum”)

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