Just doodling. Copyright 2019 Doug Peters (DP of Symbiotic Design). CC0 License (Creative Commons Public Domain Dedication) freeware.
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In the future, I will merge the Sigma Modern fonts into a only one font.
Note : This font can be combined with other Sigma Modern variants, Such a Sigma Modern 2
Update:
1. Font updated to Unicode
2. Slab "I", "i" and "l" is moved to Private Use Area
3. Some minor changes to "Lowercase S"
4. Added Minus Sign