the moon; a literary name for the moon based on the legend that a toad lives in the palace there
imperial examinations
(metaphorical) the imperial examinations, especially in the context of passing them (often referred to as climbing the Moon Palace to pluck a laurel branch)
Moon Palace
the palace in the moon where the goddess Chang'e and the jade rabbit are said to live (the 广寒宫guǎnghángōng)