The signal indication was clear, so the train proceeded safely.

The indicator diagrams show the performance of the engine.

The indicator diagram is a graphical representation of the pressure-volume relationship in an engine.

Indicator functions are used in mathematical analysis.

Clustered indices are used to improve the performance of database queries.

The indices verborum provide a comprehensive list of words used in the text.

Nonclustered indices are used to improve the performance of database queries.

The refractive indices of the two materials are different.

The signal indications were clear and easy to understand.

The vulnerability indices provide a comprehensive assessment of the region's susceptibility to natural disasters.