A star is a non-convex five-pointed polygon which looks like a star. In modern world, two types of stars are widely used as an idea of star tattoo – Pentagram and Nautical Stars, which stand for hope, goals, protection, safe.
As for pentagram, it represents different meanings for points up or down. A downward facings pentagram is often seen as the sign of the Devil. Otherwise, the pentagram is often seen as a symbol of protection and balance.
As stars used to be utilized as navigation at night, Sailors would then ink nautical stars on them because they relied on the stars to take them to the right direction and they hoped their star tattoos would bring safety all their way.
Nowadays people love star tattoos maybe for different reasons other than their symbolic meanings, e.g., shooting stars, stars with other shapes. They may love star tattoos for their beauty. Shooting stars may capture a moment that left a lasting impression, a short romance, special event, anything that may have changed the one’s life.