Judging from the number of words in poetry, there are so-called four-character poems, five-character poems, seven-character poems and miscellaneous poems. Four words are four words, five words are five words and seven words are seven words.
After the Tang dynasty, it was called modern poetry, so it was usually divided into five words and seven words. Five-character ancient poems are referred to as five ancient poems for short; Seven-character ancient poems are referred to as seven ancient poems for short, and those who use three, five and seven characters at the same time are generally considered as seven ancient poems.