1. Rabbit: In Japanese, "usagi" (兎 or うさぎ) simply means rabbit. This is its most common meaning.
2. Sailor Moon: In the popular anime and manga series "Sailor Moon," the main character, Usagi Tsukino, is also known as Sailor Moon. She is a magical girl who transforms into a powerful warrior to protect the Earth from evil.
3. Japanese Folklore: In some Japanese folklore, the rabbit is associated with longevity, prosperity, and good luck.
4. Japanese Mythology: The moon rabbit (月兎, tsuki no usagi) is a figure in Japanese mythology that is said to live on the moon and pound mochi (rice cakes).
To understand which meaning of "usagi" is intended, it's best to consider the context in which the word is used.