A syllable is a unit of organization for a sequence of speech sounds typically made up of a syllable nucleus (most often a vowel) with optional initial and final margins (typically, consonants). Syllables are often considered the phonological "building blocks" of words. They can influence the rhythm of a language, its prosody, its poetic metre and its stress patterns. Speech can usually be divided up into a whole number of syllables: for example, the word ignite is made of two syllables: ig and nite. Syllabic writing began several hundred years before the first letters. The earliest recorded syllables are on tablets written around 2800 BC in the Sumerian city of Ur. This shift from pictograms to syllables has been called "the most important advance in the history of writing". A word that consists of a single syllable (like English dog) is called a monosyllable (and is said to be monosyllabic). Similar terms include disyllable (and disyllabic; also bisyllable and bisyllabic) for a word of two syllables; trisyllable (and trisyllabic) for a word of three syllables; and polysyllable (and polysyllabic), which may refer either to a word of more than three syllables or to any word of more than one syllable. Etymology Syllable is an Anglo-Norman variation of Old French sillabe, from Latin syllaba, from Koine Greek syllabḗ (). means "the taken together", referring to letters that are taken together to make a single sound. is a verbal noun from the verb syllambánō, a compound of the preposition sýn "with" and the verb lambánō "take". The noun uses the root , which appears in the aorist tense; the present tense stem is formed by adding a nasal infix before the b and a suffix -an at the end. Transcription In the International Phonetic Alphabet (IPA), the fullstop marks syllable breaks, as in the word "astronomical" . In practice, however, IPA transcription is typically divided into words by spaces, and often these spaces are also understood to be syllable breaks. In addition, the stress mark is placed immediately before a stressed syllable, and when the stressed syllable is in the middle of a word, in practice, the stress mark also marks a syllable break, for example in the word "understood" (though the syllable boundary may still be explicitly marked with a full stop, e.g. ). When a word space comes in the middle of a syllable (that is, when a syllable spans