Answer: Gonne and menstrual cycle.
Explanation: The Cat and the Moon is, on the surface, about a cat trying to catch the moon. It’s been suggested that the cat in the poem was based on either Maud Gonne’s cat (the muse and love of Yeats), or his friend, Lady Gregory’s. However, it’s also about a dance between lovers (the cat here represents Yeats, while the moon would be Maud Gonne).
Moon is also linked to female/menstrual cycle .