Mawhrin-Skel, from The Player of Games by Iain M. Banks.
"Mawhrin-Skel, the drone which had addressed him, was by far the smallest of the machines present; it could have sat comfortably on a pair of hands. Its aura field held shifting hints of gray and brown within the band of formal blue. It looked like a model of an intricate and old-fashioned spacecraft." - The Player of Games, pg. 8