Translation

指数 / 指標 / 複数のインデックス / 添字

Meaning

Indices is a formal or technical plural of index. It is especially common for statistical measures, economic indicators, mathematical symbols, and scientific values. For book indexes, indexes is usually more ordinary.

Examples

• その報告書はいくつかの経済指標を比較しています。
  The report compares several economic indices.
• 株価指数は市場ごとに異なります。
  Stock indices differ by market.