The good 'ol split-flap displays. Lots of good maker projects out there on this and some commercial providers as well. Getting your hands on some of the old tr

The good 'ol split-flap displays. Lots of good maker projects out there on this and some commercial providers as well. Getting your hands on some of the old train-station split flap units is pretty tough. They can go upwards of $300 a character on ebay... https://en.wikipedia.org/wiki/Split-flap_display https://en.wikipedia.org/wiki/Split-flap_display https://www.oatfoundry.com/split-flap/ https://www.oatfoundry.com/split-flap/