You write a three verse ballad, in five iamb lines, then whack a couplet on the end.
From the guardian.co.uk
Stale old words derived from the Greek, like iamb and trochee, impede rather than assist the reader.
From the boston.com
The word iamb comes from Iambe, a Greek minor goddess of verse, especially scurrilous, ribald humour.
From the en.wikipedia.org
An alternate metrical tree representation of an iamb.
From the en.wikipedia.org
Iambic pentameter must always contain only five feet, and the second foot is almost always an iamb.
From the en.wikipedia.org
In this case, each iamb is underscored with a flap step.
From the en.wikipedia.org
The most common characteristic feet of English verse are the iamb in two syllables and the anapest in three.
From the en.wikipedia.org
A metrical tree representation of an iamb.
From the en.wikipedia.org
A bracketed grid representation of an iamb.
From the en.wikipedia.org
More examples
A metrical unit with unstressed-stressed syllables
Iamb is a band from the Central Coast of California. While it began as a solo recording project by frontman Ross Major, Iamb now performs with various members as a band. The music can be described as a combination of indie, post-rock, or folk music.
A metrical unit, in quantitative verse, of a short syllable followed by a long.