>>5859562>Why would a symbol be protected behind glass? This might be a "smash glass in case of emergency" type release that could open the door.I can explain this one. I wanted to find an image for the post but I couldn't find one for a door before I needed to post. It's an interlock indicator that mechanically rotates a colored symbol into place when the door is in the locked position. They're usually used for tension mechanisms where you can't intuitively tell if it's locked just by the lever hitting the end of it's travel.
