This is the 1673rd most frequent French word.
diop
The term "diop" does not appear to be a standard French word. It might be a typo or slang.
In this sentence, 'Diop' is used as a proper noun to refer to the name of the professor.
Le professeur Diop a présenté un excellent cours aujourd'hui.
Professor Diop presented an excellent lesson today.
Here, 'Diop' is again a proper name, referring to an author or writer in the context.
J'ai découvert un texte écrit par Diop qui est très inspirant.
I discovered a text written by Diop that is very inspiring.
In this sentence, 'Diop' is a proper noun representing an individual possibly renowned in African literature.