Obviously this set contains icons related to the popular TV show from the 60’s. The set contains 20 individual icons.
Also, Hieroglyphica Vol. 2 was recently released. It contains 18 individual icons and is based on Egyptian hieroglyphs (duh!).
Misson: Impossible! and Hieroglyphica Vol. 2 can be downloaded in Windows, MacOSX and Picadex formats. Check Iconfactory’s freeware page for links to download the various free icon sets.