What does this icon mean? I use a gopro hero 3+ silver camera as a bike camera.  It works moderately well for this role.  Recently its started locking up and displaying this icon on screen.

Sorry for the potato photo, but to me that is a stylised icon of a bike riding away, from a low point of view.

Did the camera determine it was on a bike by vibrations?

Or am I seeing an image where its really something else unrelated to biking ?
Yes, the icon represents the error "File Repair". Related to cycling I've seen others have these issues with mounts at times. In my experience, mount to rider is better than mount to bicycle. Check to make sure your mount isn't coming loose. Check the SD card too, just in case, although the camera should throw an "SD Card Error" if that was the case. Last check any recent created files for quality.