(idiomatic, proverb) be quick on the uptake, understand the whole situation from just a few clues

Kyūjitai form of 三位一体 (“Trinity”)

(obsolete) being surprised twice / (obsolete) more specifically, describes the appearance of a woman who has a beautiful figure from behind but has an ugly face

(Christianity) the Trinity

the fifth day of the month / five days

the sixth day of the month / six days

two days, a two-day period / the second day after some set point in time / the second day of the month

the fourth day of the month / four days

the third day of the month / three days

the tenth day of the month / ten days