The last three words of the poem are "Yi Tian". What kind of poem is it?

In the beer house, on the millstone; Relying on the sword and hanging the bow to help the mulberry. (Li Bai)

Relying on the sword and hanging the bow to help the mulberry-Li Bai This is Mr. Guo Moruo's title: Jiangyou Li Bai Memorial Hall couplet (the iron pestle is ground into a needle, and the teenager is determined to drink in the flowers, sing poems and compose poems, and hang the bow and lean on the sword, like a knight. )