[3] I は sans-serif で縦棒になるものと、上下に線が付くものがあります。
i[5] Turkish Feature Locl, , https://localfonts.eu/typography-basics/fonts-the-importance-of-localisation/local-features/turkish-feature-locl/
[7] What is i.latnTRK — TypeDrawers, , https://typedrawers.com/discussion/932/what-is-i-latntrk
[8] Localize your font: Turkish i | Glyphs, https://glyphsapp.com/learn/localize-your-font-turkish
I と i