1988 560sel....when i turn on the lights, there is a dash light by the abs warning light that comes on....

does anyone know what that particular light means?

lyle

What does the bulb's symbol look like and what colour is it?

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1989 300CE

If it is when you turn on the lights, it is probably the bulb out warning light.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Yes, that would be it. Go and check every exterior light.

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1989 300CE