Final answer:
The symbol for a subset in mathematics is ⊂, indicating that all elements of one set are contained within another set.
Step-by-step explanation:
The symbol for subset in mathematics is ⊂. For example, if we have two sets A and B, we say A is a subset of B if every element of A is also an element of B, which can be written as A ⊂ B. It's important to remember that even if set A is identical to set B, A is still considered a subset of B. A proper subset, where set A is a subset of B but not equal to B, is represented by the symbol ⊊.