Answer
$\text{subset, }\subseteq$
Work Step by Step
A set $A$ is a subset of another set $B$ if all the elements of $A$ are also in $B$. (we denote this by $A\subseteq B$)
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.