A character or symbol set slightly below the normal line of type, commonly used in mathematical and chemical formulas.
In chemical formulas, the number of atoms is indicated with a subscript.
The '2' in H₂O is a subscript.
上付き添字 is a superscript, placed above the normal line, while 下付き添字 is a subscript, placed below.
Standard kanji spelling for 'subscript'.
Variant spelling using 添え字 instead of 添字; both are used.
Compound of 下付き (したつき, 'attached below') + 添字 (そえじ, 'added character').