TwoSix IO Zero is an inline / outline typeface in eight weights based on MuirMcNeil TwoSix, a part of the extensive Two Type System. In TwoSix Zero, all letter spacing has been eliminated so that adjacent characters touch each other, with their outlines overlapping precisely.

TwoSix IO Zero is supplemented by a set of eight monospaced alternates in the same stroke weights. These are compatible with the Two Type system where a common grid determines the positioning of all letterforms and spacing, allowing layered glyph combinations.
four-three
four-three