An isoceles triangle has 2 congruent sides of equal length, and one of a different length.
(If all three side lengths are the same, you have an equilateral triangle, which is also equiangular, each angle 60°).
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Only two equal side lengths
that's an iscoceles triangle...
Isosceles.
A triangle with 2 equal side lengths is called an isosceles triangle.
You must have more information to determine what type of triangle it is. If two of the lengths are equal, it is isosceles. If all three of the lengths are equal, it is equilateral. If none of them are equal, it is scalene. It may also be a right triangle if it is isosceles or scalene.