Prime Directive, created by Michael Gaines, is a free Star Trek portrait dingbat font built around stark head-and-shoulders character illustrations. The set leans on recognisable sci-fi uniforms, insignia, and clean inked outlines, so the overall feel is less ornamental than collectible - more like a sheet of fan emblems and crew portraits translated into crisp graphic symbols.
This free font fits naturally in fan zines, convention flyers, themed posters, trivia cards, and episode-guide graphics where a few bold character marks do the work fast. It also makes sense for title cards, section breaks, badges, or scrapbook-style layouts, because the portraits read as compact visual cues rather than ordinary lettering.