Polyglot file

A single file simultaneously valid in multiple formats — e.g. a ZIP archive appended to a cross-platform executable — enabling self-contained, single-artifact distribution.

grounded in: Show HN 'Redbean' — a single-file distributable web server that appends its served assets as a ZIP to an Actually Portable Executable (APE) binary, itself a polyglot valid as shell script + PE + ELF +