What does this tattoo mean?

If the traffic sign triangle with deer means "pay attention to wildlife".

This warning sign generally appears in forests and mountainous areas, indicating that wild animals may appear near the road, reminding vehicles to drive slowly, so as to avoid sudden jumping out of wild animals on both sides of the road and causing traffic accidents.

As far as traditional culture is concerned,

Deer: homophonic with the word "deer", symbolizing good luck, longevity and promotion. Legend has it that Millennium is a pale deer, and 2000 is a mysterious deer. So deer is a fairy beast and has a long life. Deer often use cranes to defend Ganoderma lucidum Cao Xian. The word "deer" is homophonic with the word "Lu" in the three auspicious stars, so it is often used in some pattern organizations to express longevity and prosperity.

Modern times have a new explanation for deer. Getting rich has a deer "road", which is homophonic. Good luck means getting rich.