From 气 ("gas") and 丿 (a basic stroke of Chinese characters, called 撇 (piě, "to discard")). The pronunciation piē came partly from "丿" (piě, the stroke name), partly from the European name (protium). Pronounced with a yinping tone, by analogy with 氘 (dāo, "deuterium"), 氚 (chuān, "tritium"). See also 氫 (qīng, "hydrogen").
- KangXi: not present, would follow page 599, character 3
- Hanyu Da Zidian: volume 3, page 2010, character 2
- Unihan data for U+6C15
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