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If you mean any polarity on input signal (e.g. 110/230V utility line) then try to make full wave rectifier. You can arrange DC voltage level in . Only by zero signals LED is going to be off.
If polarity may vary you have to treat that signal the same way as if it was ac ..
For switching polarity you need a rectifier bridge followed by a standard resistor-LED configuration .. see attached picture ..
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