Answer:
9 is an element of set T.
Explanation:
We are asked to find the meaning of the mathematical expression 9 ∈ T.
We know that sign ∈ means element of a set or a member of a set.
The expression 9 ∈ means 9 is an element of.
9 ∈ T means 9 is an element of set T.
Therefore, the meaning of our given expression is 9 is an element of set T.