In electricity current is shown as ' I ' in short form.
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Nabil answered this
in chemistry "I" is iodine
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Gaurav Joshi answered this
I ENGLISH ninth letter and third vowel in the English, Greek, and Roman alphabets
IN CHEMISTRY Iodine has a symbol I, chemically reactive element, a blue-black solid at room temperature. In group 17 of the periodic table iodine is one of the halogens. Its atomic number is 53