氕 piē hydrogen-1 Definitions Defs Origin Strokes Stroke Words Sentences Sents 氕 piē protium the most common isotope of hydrogen, with an atomic weight of 1 Frequency Character Written text 7,374th most common 0.036 per million Word Written text 0.009 per million Details Strokes 5 Unicode U+6C15 Sources Frequency data MTSU Chinese text computingBCC Corpus (BLCU)