- 二 numeraltwothe number two; 2
- sulfur(bound form) sulfur; a nonmetallic chemical element with the symbol S
- 化 affixparticle[...-ize]Suffix appearing after nouns or adjectives that expresses a transformation into a certain state or quality, meaning "-ize" or "-ization"
- 碳 nouncarbonnonmetallic element (C); the essential component of organic matter, existing in nature as diamond, graphite, and coal