1. **State the problem:** We need to express the number of moons as a fraction of the entire set of shapes. 2. **Identify total shapes and moons:** There are 16 shapes in total and 3 of them are moons. 3. **Write the fraction:** The fraction representing moons out of the total shapes is $$\frac{3}{16}$$. 4. **Simplify the fraction if possible:** Since 3 and 16 have no common factors other than 1, the fraction is already in simplest form. 5. **Final answer:** The moons represent $$\frac{3}{16}$$ of the entire set.