ProtoSans40 by Roman Gornitsky is a free blocky techno display font built from broad rectangular strokes. Its squared forms, abrupt corners, and compact cutouts give the lettering the look of a modular digital alphabet.
Grid graphics and simple circuit diagrams can extend the same rectangular logic across posters and game interfaces. It also suits electronic music packaging and science-fiction event branding. The repeated square openings can become windows, screens, or panel details within accompanying illustrations.