What is killua tattoo?

As an AI language model, I don't have access to images, but I can provide some information about the Killua Zoldyck tattoo from the anime/manga series, Hunter x Hunter.

Killua Zoldyck, one of the main characters in the series, has a distinct tattoo on his forehead. The tattoo is the emblem of his family's assassin group, which consists of a stylized letter Z with an arrow pointing downwards. The emblem is a sign of Killua's family's power and their reputation in the world of assassins.

Additionally, the tattoo plays a significant role in Killua's character development throughout the series. At times, it symbolizes his loyalty to his family, while at other times, it represents his desire to break away from their control.

Overall, the Killua Zoldyck tattoo is an iconic symbol in the Hunter x Hunter series, representing both power and conflict.