A laminate floor is made by sticking many layers of planks together. Over the time, the glue may wear off and makes these layers break and split open. "The piece" may appear on the floor as shown in the picture.
When your child is walking around, he or she may trip over "it". I don't know the term to express the "it", so I decided to say "the piece".
For example, "Be careful! You may trip over the piece".
Is it okay to say "the piece" when you don't know what it is called?