Quatrains
The name of the three four-line rhyming units used in a Sonnet is a "quatrain." Sonnets typically contain three quatrains followed by a concluding rhymed couplet.
Quatrains
ABAB, CDCD, and EFEF
They are called quatrains, which means "four line unit". They are followed by a couplet, which means "two line unit".
A Shakespearean sonnet has three quatrains (four-line stanzas) followed by a rhyming couplet (two-line stanza) at the end. This structure is also known as the English sonnet.
A Petrarchean sonnet is divided into two sections, an octave and a sestet, whereas a Shakespearean sonnet is divided into four sections, three quatrains and a couplet.
Quatrains. Sonnets are usually dived into either eight then six lines, called an octave and sestet, or into four quatrains and a couplet. The first structure is more common in Petrachan sonnets, also known as Italian sonnets, the second in Shakespearean.
units,tenths,hundredths,thousandths - 3.004, three and four one thousandths
All of Shakespeare's sonnets end with a couplet. He divided the fourteen lines into three groups of four, with two at the end, in which he could sum up his point.
Four. Qua is a prefix, meaning four.
Shakespeare's Sonnet 30 is written in the typical Shakespearean sonnet rhyme scheme of abab cdcd efef gg. This is a quatrain-couplet division with three quatrains of four lines followed by a two-line couplet. There are 7 total rhymes in a Shakespearean sonnet. Shakespearean sonnets are written in iambic pentameter.
Venus and Adonis, The Rape of Lucrece, The Phoenix and the Turtle, Sonnet XVIII. All the sonnets are known only by numbers so one could as easily say Sonnet 1, Sonnet 2, Sonnet 3 and Sonnet 4. Those are certainly four of Shakespeare's poems.
There are fourteen lines, organized in three units of four lines called quatrains and a final couplet of two lines. In a Shakespearean sonnet the quatrains generally set up the situation and the couplet comments on it or sums it up. Sometimes Shakespeare wrote with a more Petrarchian setup, where the first eight lines set up the situation, and the last six take it in a different direction.