Why does cubase say output is reserved?

I can’t work out why these outputs say reserved

Cubase uses the port names that the driver reports. But you could change them in “Studio Setup->Audio System->(Your Audio device)”, in the “show as column”.

thank you , I did find that and have named my ports in cubase. but haven’t got to the bottom of the reserved ports I guess its UAD but I have never seen this before in Logic