添そえ字じ

noun

subscript; superscript

General term for a character or symbol written smaller and slightly above or below the baseline, as in chemical formulas or mathematical notation.

• H₂Oの「₂」は添そえ字じです。

  The '₂' in H₂O is a subscript.

• x²の「²」は上うえ付つきの添そえ字じです。

  The '²' in x² is a superscript.

noun

index (mathematics)

In mathematics, a subscript or superscript used to label elements of a sequence, vector, or tensor; often read as a number or letter attached to a variable.

• 数すう列れつ a₁, a₂, a₃ の添そえ字じは項こうの番ばん号ごうを表あらわす。

  The subscripts in the sequence a₁, a₂, a₃ indicate the term numbers.