It's called titlecase and common in many publications. https://en.wikipedia.org/wiki/Letter_case#Headings_and_publication_titles https://en.wikipedia.org/wiki/

It's called titlecase and common in many publications. https://en.wikipedia.org/wiki/Letter_case#Headings_and_publication_titles https://en.wikipedia.org/wiki/Letter_case#Headings_and_publi...