An LED writing has led me to some experiments, I had so marked an LED matrix font, but then instead of dots, rings used ...
* German to English Translation provided by Google Translate
Ring Matrix font contains 292 defined characters and 261 unique glyphs. The font contains characters from the following unicode character ranges: Basic Latin (93), Latin-1 Supplement (91), Latin Extended-A (7), Latin Extended-B (1), Spacing Modifier Letters (2), Greek and Coptic (70), General Punctuation (15), Currency Symbols (1), Letterlike Symbols (1), Arrows (1), Mathematical Operators (8), Private Use Area (1).
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