Why are many literary works called untitled?

I think it's because the author can't find a suitable topic to describe the mentality and the realm of the article at that time.

Untitled

Li shangyin

It was a long time ago that I met her, but since we separated, the time has become longer, the east wind is blowing and a hundred flowers are blooming.

Silkworms in spring will weave until they die, and when the torch turns to ashes, tears will flow dry.

In the morning, she saw her hair cloud changing in the mirror, but she bravely faced the cold of the moonlight with her evening song.

Not far from her charming mountain, oh, bluebird, listen! -Give me what she said! .

Lu Xun: Untitled

There is usually a long night in spring, and a loyal wife will paint silk on her young temples.

In my dream, I shed tears for my mother, and the flag of the king in the city changed.

Endure watching peers become new ghosts, and look for poetry in anger.

There is no place to write, and the moonlight is like water.

Lu Xun (188 1- 1936), formerly known as Zhou Shuren, was born in Shaoxing, Zhejiang. Contemporary writer, once a professor at Beijing Women's Normal University, Xiamen University and Sun Yat-sen University. He is the author of The Complete Works of Lu Xun and Selected Poems and Songs of Lu Xun.

This poem was written in February 193 1. 1932 In July, Lu Xun presented this collection of poems to the Japanese poet Yamamoto Chuzhi. 1933 In February, when Lu Xun wrote "Remembering Forgetting", he included this poem in this article. 193 1 year 1 month 17, five left-wing young writers, including Rou Shi, Li Weisen, Hu Yepin, Yin Fu and Feng Keng, were arrested and secretly executed in garrison headquarters, Longhua, Shanghai late at night on February 7. At this time, Lu Xun was living in a Japanese apartment in garden village. Lu Xun was very angry when he learned that five young people had been killed and wrote this poem.

Note ① Chengtou: refers to Nanjing. Wang Qi refers to Chiang Kai-shek's reactionary rule. ② peers: Rou Shi, Li Weisen, Hu Yepin, Yin Fu, Feng Keng, etc. ③ Knife cluster: refers to the white terror practiced by the Kuomintang. Clothes: clothes made of black cloth.