Rubāʿī (Persian: رباعی‎‎ rubāʿī) is a poem, or verse of a poem, consisting of four lines. It refers specifically to a Persian quatrain, or its derivative form in English and other languages. The plural form of the word, رباعيات rubāʿiyāt, often anglicised as rubaiyat, is used for a collection of such quatrains. There are a number of possible rhyme schemes to the rubaiyat form, e.g. AABA, AAAA. In Persian verse, the ruba'i is usually written as a four-line (or two-couplet) poem, with rhymes at the middle and end of each line. An author described;