Bob and wheel is the common name for a metrical device most famously used by the Pearl Poet in Sir Gawain and the Green Knight. The feature is found mainly in Middle English and Middle Scots poetry, where the bob and wheel occur typically at the end of a stanza. The "bob" is a very short line, sometimes of only two syllables, followed by the "wheel," longer lines with internal rhyme. There are at least forty known examples of bob and wheel use, but the origin of the form is obscure. It seems to predate the Pearl Poet. Bob and wheel is not used often in modern poetry.