Where does the name 'Ens$_V$' come from? The book I'm reading describes **Ens $_V$** as: Where $V$ is any set of sets, the category with objects all $X \in V$, and arrows all functions $X \rightarrow Y$, with the usual function composition. * What does the name **Ens $_V$** come from? * What is it short for? * How do you refer to it in speech?

It's short for "Ensemble" which is French for "set". I guess you can pronounce it as is natural for you, but just in case, the French pronunciation goes [ɑ̃sɑ̃bl], where [ɑ̃] can be found in the more well-known words "an" (year), "jambe" (leg), "sang" (blood), "temps" (time).