We’re used to seeing all manner of seven-segment displays, be they mechanical ... it supports the full hexadecimal character set, or even duodecimal if you like. [Dave] has shared the library ...

seven-segment display (Image courtesy of LXD, Inc.) In their natural state, liquid crystals line up with the orientation "rubbed" into the front and rear glass panels. The rubbings are microscopic ...

We’re not sure, but the number of recognizable alphanumeric characters that a seven-segment display can manage seems to have more to do with human pattern recognition than engineering.