If $a \in X$ we can say "$X$ contains $a$". Is there a corresponding verb for the relation $A \subset X$?

Question

Obviously I can say "$X$ has $A$ as a subset" or "$A$ is a subset of $X$", but I'd like a more concise way of putting this.

Answer 1

$A \subset X$ translates to A is subset of X. You can say that A is included in B, as @Mauro said in the comment.

Moreover you can say, every element in set A is present in set X. This is one of the most mathematically true statement you can say for $A \subset X$.

Mathematically representing, $\forall x $ | $ x \in A \implies x \in X $