Returning to her hotel, Adrienne found the red diode blinking on the telephone next to the bed.

He pointed at the flashing red diode on the little electronic tap-detector connected to the telephone's base.

The ad, which will appear in 300,000 copies of the issue, includes 23 tiny red light-emitting diodes that glow when a button is pressed.

Others are experimenting with ways to mix red, blue and green diodes to create a white beam.

(Actually, with most sensors there are two green for each blue and red diodes.)

Above it was a small video camera angled down, with a red diode glowing above the lens.

The red diodes of the ignition timer counted positive seconds into the burn.

A red light-emitting diode flashes, indicating that it is charging.

This was the first in-story appearance of Brainiac's iconic red diodes atop his head.

Brainiac's distinctive gridwork of red diodes across his head are also explained.