Five Star Gift Ideas

Based on the limited information provided, it seems that your friend enjoys mathematics and problem-solving. With that in mind, here are a few gift ideas that might suit their interests:

1. Mathematical Puzzle: Consider getting your friend a mathematical puzzle that will challenge their problem-solving abilities. A Rubik's Cube or a Sudoku puzzle book could provide hours of entertainment and mental stimulation.

2. Math-themed T-Shirt: Look for a t-shirt or hoodie with a math-related design or a clever mathematical joke. This gift would allow your friend to showcase their affinity for mathematics while also adding a touch of humor to their wardrobe.

3. Math Books: If your friend enjoys reading, you could gift them a book that delves into an interesting branch of mathematics or a biography of a well-known mathematician. Some popular options include "Fermat's Enigma" by Simon Singh or "The Man Who Knew Infinity" by Robert Kanigel.

4. Math Art: Consider finding a piece of art that incorporates mathematical concepts or patterns for your friend's living space. It could be a framed print of an Escher artwork or a poster illustrating mathematical formulas and equations. This gift combines their love for mathematics with a visually appealing decoration.

5. Math Apps or Software: Check if there are any math-related apps or software programs that your friend might enjoy. Whether it's a graphing calculator app or a mathematics game, they can have fun exploring new concepts and challenging themselves in a digital format.

6. Membership to a Math Club or Organization: If your friend enjoys discussing mathematics with like-minded individuals, consider gifting them a membership to a math club or organization. These groups often hold meetings, events, and lectures where your friend can engage in stimulating conversations and expand their mathematical knowledge.

Remember to consider your friend's personal preferences and the level of complexity they prefer when selecting a gift. By choosing something related to their interests, you'll show that you value their passions and took the time to find a thoughtful and personal gift.

Or you can get her/him a star map with the date when she/he was born.