Ancient name. Known in China long before modern chemistry; the old character was kept. Named in ancient China
History of the character
Every form found in the sources, from the first missionary chemistry books of the 1850s to the current
standards. Hover a dot for the source. Simplified 锡, traditional 錫, Taiwan 錫xí.
antiquity錫xī古名 Pre-modern usage, Classical texts (Shuōwén Jiězì, Běncǎo Gāngmù)one of the Five Metals; phonetic 易 reflects an old pronunciation
1933錫xī化學命名原則 Principles of Chemical Nomenclature, Zhèng Zhènwén (鄭貞文), National Institute for Compilation and TranslationinferredInferred: known by 1933, when the Principles fixed one character per element, and no later change is recorded.
Homophones
Sounds exactly like 硒 Selenium.
Only the written radical tells them apart.