A modular font is defined by its reliance on a "kit of parts." Rather than drawing each letter individually, the designer creates a few core shapes (modules) that serve as the building blocks for every glyph.

An HK Modular font is therefore a dual-script type system where both English letters and Chinese radicals are built from a standardized set of "modules." Unlike traditional calligraphy, which relies on varied brush pressure and fluid angles, modular type is rigid, systematic, and often monospaced.