The sonnet is one of several forms of poetry originating in Europe. The term "sonnet" derives from the Occitan word sonet and the Italian word sonetto, both meaning "little song" or "little sound". By the thirteenth century, it had come to signify a poem of fourteen lines that follows a strict rhyme scheme and specific structure. The conventions associated with the sonnet have evolved over its history. The writers of sonnets are sometimes referred to as "sonneteers," although the term can be used derisively. One of the best-known sonnet writers is William Shakespeare, who wrote 154 of them (not including those that appear in his plays). A Shakespearean, or English, sonnet consists of 14 lines, each line containing ten syllables and written in iambic pentameter, in which a pattern of an unstressed syllable followed by a stressed syllable is repeated five times. The rhyme scheme in a Shakespearean sonnet is a-b-a-b, c-d-c-d, e-f-e-f, g-g; the last two lines are a rhyming couplet.