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A quatrain is a poem, or a stanza within a poem, that consists always of four lines. It is the most common of all stanza forms in European poetry. The rhyming patterns include aabb, abab, abba, abcb.

In its narrow meaning, the term is restricted to a complete poem consisting of only four lines. In its broader sense, it includes any one of many four-verse stanza forms.

• abab (from "The Unquiet Grave")

"The wind doth blow today, my love

And a few small drops of rain;

I never had but one true-love

In cold grave she was lain.

• abcb (from "The Wife of Usher's Well")
  

There lived a wife at Usher's Well,

And a wealthy wife was she;

She had three stout and stalwart sons,

And sent them over the sea.

• aabb (from William Blake, "The Tyger")
  

Tyger! Tyger! burning bright

In the forests of the night,

What immortal hand or eye

Could frame thy fearful symmetry?

• abba, also called the envelope stanza or introverted quatrain (from Tennyson In Memoriam)

Strong Son of God, immortal Love,

Whom we, that have not seen thy face,

By faith, and faith alone, embrace,

Believeing where we cannot prove;

• aaba, or the Omar Khayyám stanza (also known as Rubaiyat)

Awake! for Morning in the Bowl of Night,

Has flung the Stone that puts the stars to flight:

And Lo! the Hunter of the East has caught

The Sultan's Turret in a Noose of light.

• The heroic stanza or elegiac stanza (iambic pentameter, rhyming ABAB; from Thomas Gray's "Elegy Written in a Country Church-yard")
  

The Curfew tolls the knell of parting day,

The lowing herd wind slowly o'er the lea,

The plowman homeward plods his weary way,

And leaves the world to darkness and to me.

• The Shichigon-zekku form used in Chinese and Japanese poetry. Both rhyme and rhythm are key elements, although the former is not restricted to falling at the end of the phrase.

• Ballad meter (The examples from "The Unquiet Grave" and "The Wife of Usher's Well" are both examples of ballad meter.)

• Various hymns employ specific forms, such as the common meter, long meter, and short meter.

• Rubaiyat of Omar Khayyam, a collection of Persian quatrains written by Omar Khayyám
• Nostradamus, writer of prophetic quatrains

• Poetic Form of Quatrain: A Research Note by Dr Manouchehr Saadat Noury.