The first one I found is 5x5 dots.
But I think it is far from ideal, all letters having the same hight.
Why not name a font that you think would be the best if it only were in dots? Then I'll make you the font.
When I was young and ignoranent we learned the shape of the letters with the help of letters cut out of sandpaper glued on pieces of board. Amazing that I can still remember this.
Personally I think that the Dnealianmanuscriptlined (what a name!!) would be a better option. Specially the cursieve font.
Shall it be dotted? Sandpaper, though, is still better. It made me manage writing before typing!
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