Sue has four pronunciations. They are ω, ω, ω and ω respectively. One meaning of "Guo" is "one night (Su Mo, Suyu), every other year (perennial)".
The other three meanings are the ancient names of Xi 'an constellation, stars and twenty-eight nights. X incarnates as a surname (pronounced as surname, pronounced as "徾").
Xi incarnation quantifier, used to calculate night: one night, two nights.
Su Mo means overnight ink, that is, unused ink in the inkstone studied the day before.
Su Mo and inkstone are separate. When Su Mo began to degum, it was sticky, dark and seeping, so it was not suitable for writing. Therefore, general calligraphy pays attention to not using Su Mo. But when it is used for painting, there is a kind of misty rain that can be used.