tl;dr: Iosevka is an open-source monospace typeface family designed for code, terminals, and technical documents, offered in sans-serif and slab-serif variants with Normal and Extended widths, plus specialized Term and Fixed subfamilies for terminal use. It features 146 configurable characters across 19 stylistic sets, extensive OpenType ligatures (including long arrows), and supports 248 languages. Quasi-proportional variants (Aile and Etoile) are also included for prose and documentation.