Thanks a lot @mas and (@Johnb)
yes Marc (@mas) this is what I think too, it is the emergency handle. my research for that on other Mirage did just came up with something "Emergency" mostly written inside an arrow. So for this I decided to opt for an yellow frame with Emergency as wording, but printet it is so small, that my printer just makes dots aout of it. So I keep it as dots.
John (@Johnb) I use an insulation tape made from aluminum for that. This tape is about 2 or 3 times thicker than avaerage household alu foil.