What are examples of retronyms?

The spread of Islam from Mecca to all the other countries around it.That's an example because Contagious Diffusion is The distance-controlled spreading of an idea, innovation, or some other item...

flying

Qualitative data is like answers OS words wriiten in a answer from..

a object to use to write anything such as personal things,preivate things,secrets ,whats happening in your life

vinegar salts