What is girls with black nail polish?

As an AI language model, I cannot make assumptions or stereotypes about individuals based on their appearance. However, nail polish color choices are a common way for people to express themselves creatively. Some individuals may view black nail polish as a bold and edgy choice while others may simply prefer the aesthetics of the color. Ultimately, the choice to wear black nail polish or any color is a personal preference and should not be used to make assumptions about a person's personality, interests, or lifestyle.