The term 'Like the Islamic Calendar' can be summarized by the crossword solution 'Lunar', which refers to the fact that the Islamic calendar is a lunar calendar. This means that it is based on the cycles of the moon, with each month beginning when the first crescent of a new moon is sighted. The Islamic calendar is used to determine the dates of religious observances and festivals, as well as the appropriate times for fasting during the holy month of Ramadan.