What is a b in poetry?

It seems like you're asking about the "b" in "abba" or "abab" rhyme schemes. This refers to the second rhyming sound in a quatrain (a four-line stanza).

Here's a breakdown:

* A represents the first rhyming sound in the stanza.

* B represents the second rhyming sound in the stanza.

For example:

A The cat sat on the mat. (A)

B The dog ran down the street. (B)

B The bird sang a sweet song. (B)

A The sun shone bright and neat. (A)

In this example, the words "mat," "street," and "sweet" all rhyme, while "neat" rhymes with "mat." This follows the "abba" rhyme scheme.

Let me know if you have any other questions about poetry or rhyme schemes!