What is the pattern of stanza by which a poem built called?

The pattern of stanzas by which a poem is built is called stanza form.

Here are some examples:

* Couplet: Two-line stanza

* Tercet: Three-line stanza

* Quatrain: Four-line stanza

* Cinquain: Five-line stanza

* Sestet: Six-line stanza

* Septet: Seven-line stanza

* Octave: Eight-line stanza

It's important to note that some poems don't follow a strict stanza form, but instead have irregular stanzas or even just one long line.