They are an early warning indicator of climate change.

The Machmeter is, on subsonic aircraft, a warning indicator.

The warning indicator flicked as his forefinger took up the slack on the trigger key.

Get-rich-schemes of this nature habitually share the same warning indicators that include, but are not limited to:

Benjamin exclaimed with such vigor that the warning indicator on his portable lung swung into the red.

But in more bullish markets, he said, "It's a good early warning indicator that there is a change in perception."

Keith could see constellations of yellow warning indicators lighting up on the pilot's panel.

The imaging might provide an early warning indicator for warming by showing a change in distribution and stress level.

The warning indicators on his suit HUD started to turn amber, then red.

Even as the beam connected, however, a shimmer ran down the thread of light, a warning indicator that his charge was nearly exhausted.