A runabout is a cute little mini-vessel that is totally awesome, and way cooler than a shuttlecraft. DS9 blew one up every week for most of a decade. They were all named after rivers on Earth, which was really fuckin' egotistical of the humans if you ask me. Despite being smaller than a commuter bus, these ships still had jeffries tubes. That's some reeeeeeeeal impressive dumbass design there, Starfleet.