Sorry, not a native speaker, I was under the impression that aerospace means air and space. I guess i meant aviation.
I didn’t imply knots are mph, I used the slash to signify “or”. They are completely different units, but both are used. Sometimes the airspeed indicator even has two scales, one for kt and one for mph.
And knots are not mph, they're "nautical miles per hour" which are a different measure (1nm is 1.8km, not 1.6km as the regular mile")