Possible problem with Solidworks

Hey guys! I’m the CAD designer for my robotics team (Leilehua High School/Wahiawa, HI: FRC Team 4158, VRC Teams 7312, 7312B), and as I completed a rendering of our current robot, the components in the assembly suddenly had a feather-like symbol appear next to them. Is this something I should be wary of? I haven’t come across this before, so I just wanted to take precautions. Your help is greatly appreciated! Thank you/Mahalo!