Monday – (Moon) or Dies Lunae (Latin for “day of the Moon”)
The term "Monday - (Moon)" seems to refer to the etymology of the word "Monday". The name Monday is derived from Old English "Monandæg" and Middle English "Monenday", which mean "moon day". This is based on a translation of the Latin name "dies lunae". So, the term "Monday - (Moon)" likely refers to the fact that the name for Monday is derived from the word for moon.