wall crawler

noun2

1. •
   something which adheres to and crawls upon vertical surfaces

   • The wall crawler will also take ultrasound readings to reveal pits and cracks beneath the surface of the steel walls. — 1995
2. •
   something which adheres to and crawls upon vertical surfaces

   • As Mother Jones goes to press, the masked, web-slinging wall-crawler is busy foiling a computer technician's evil designs to brainwash people through subliminal advertising in video games. — 1983