I had a desk phone back in the day, with the handset, spiral cord, plugged into a wall POTS outlet. The only light it had, an actual lamp, not an LED was a logo stencil which blinked when a incoming caller had left a message on the cassette recorder. Some sort of stylized 'V'. Probably all sorts of prior art, not to mention being obvious.
Lenovo ThinkPad laptops currently use the red dot in the i of Think as an indicator, so that's a current example of prior art that uses the logo as an indicator.
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Desktop Phone Voice Recording Indicator (Score:3, Insightful)
Re: (Score:1)
Lenovo ThinkPad laptops currently use the red dot in the i of Think as an indicator, so that's a current example of prior art that uses the logo as an indicator.