What is aiko?

Would you please specify which "Aiko" you are referring to? There are several notable individuals and entities with the name Aiko, including:

1. Aiko, Princess Toshi: She is the daughter of Crown Prince Fumihito and Crown Princess Kiko of Japan. Born on December 1, 2001, she is a member of the Japanese imperial family.

2. Aiko (singer): Aiko, born Aiko Yanai on November 22, 1975, is a popular Japanese singer-songwriter. She has released numerous albums and singles, known for her heartfelt lyrics and melodies.

3. Aiko (artist): Lady Aiko Nakagawa is a Japanese street artist known for her pop art-influenced works that often combine traditional Japanese motifs with modern urban imagery.

4. Aiko Robot: There might be reference to Aiko, a humanoid robot created by inventor Le Trung, designed to mimic human behavior and interact with people.

Please let me know which Aiko you are inquiring about, or provide additional context, so I can give you more detailed information!