In poetry, a stanza (; from Italian stanza , "room") is a grouped set of lines within a poem, usually set off from other stanzas by a blank line or indentation. Stanzas can have regular rhyme and metrical schemes, though stanzas are not strictly required to have either. There are many unique . Some stanzaic forms are simple, such as four-line quatrains. Other forms are more complex, such as the Spenserian stanza. Fixed verse poems, such as sestinas, can be defined by the number and form of their stanzas. The term stanza is similar to strophe, though strophe is sometimes used to refer to irregular set of lines, as opposed to regular, rhymed stanzas.