This is the 607th most frequent Chinese word.
诗
"诗" means "poem" or "poetry."
In this sentence, "诗" is used as part of the compound word "诗人" which means poet, referring to a person who writes poems.
李白是一位著名的诗人。
Li Bai is a famous poet.
Here, "诗" refers to a poem, specifically denoting a single piece of this literary form.
他写了一首感人的诗。
He wrote a moving poem.
In this context, "诗" represents poetry as a genre or artistic expression.