https://he.wikipedia.org/wiki/%D7%A2%D7%96%D7%A8%D7%94:%D7%A0%D7%95%D7%A1%D7%97%D7%90%D7%95%D7%AA
CO 2 {\displaystyle {\ce {CO2}}} co 2 {\displaystyle {\ce {co2}}}