u/Mindless_Sea_1485

I’m playing bacchanale on oboe and I’ve never seen this before what does it mean?

I recently had my clarinet serviced (less than a week ago) and as I was playing today one of the key rings felt loose and then fell off. Does anyone know a way to fix this/know a video of a way to fix it? I tried to look something up but I have no idea what it’s called. I have a Yamaha YCL-452 if you need the model of my clarinet. Please help.