Triangle Classification: Identifying a Triangle with AB = BC

To solve this problem, we'll follow these steps:

• Step 1: Identify the given information
• Step 2: Apply the properties of triangles to classify it

Now, let's work through each step:
Step 1: The triangle is given with sides $AB$ and $BC$ equal in length.
Step 2: According to the properties of triangles, a triangle with at least two equal sides is classified as an isosceles triangle.
Therefore, given that $AB = BC$, the triangle is an Isosceles triangle.

Therefore, the solution to the problem is Isosceles.