rho was geminated within a word, the first always had the smooth breathing and the second the rough breathing (ῤῥ) leading to the transliteration rrh. The vowel letters carry an additional diacritic in certain words, the so-called iota subscript, which has the shape of a small vertical stroke or a miniature below the letter. This iota represents the former offglide of what were originally long diphthongs, (i.e. ), which became monophthongized during antiquity. Another diacritic used in Greek is the diaeresis (), indicating a hiatus. This system of diacritics was first developed by the scholar Aristophanes of Byzantium ( 257 – 185/180 BC), who worked at the Musaeum in Alexandria during the third century BC. Aristophanes of Byzantium also was the first to divide poems into lines, rather than writing them like prose, and also introduced a series of signs for textual criticism. In 1982, a new, simplified orthography, known as "monotonic", was adopted for official use in Modern Greek by the Greek state. It uses only a single accent mark, the acute (also known in this context as tonos, i.e. simply "accent"), marking the stressed syllable of polysyllabic words, and occasionally the diaeresis to distinguish diphthongal from digraph readings in pairs of vowel letters, making this monotonic system very similar to the accent mark system used in Spanish. The polytonic system is still conventionally used for writing Ancient Greek, while in some book printing and generally in the usage of conservative writers it can still also be found in use for Modern Greek. Although it is not a diacritic, the comma has a similar function as a silent letter in a handful of Greek words, principally distinguishing (ó,ti, "whatever") from (óti, "that"). Romanization There are many different methods of rendering Greek text or Greek names in the Latin script. The form in which classical Greek names are conventionally rendered in English goes back to the way Greek loanwords were incorporated into Latin in antiquity. In this system, is replaced with , the diphthongs and are rendered as and (or ) respectively; and and are simplified to and respectively. Smooth breathing marks are usually ignored and rough breathing marks are usually rendered as the letter . In modern scholarly transliteration of Ancient Greek, will usually be rendered as , and the vowel combinations as respectively. The letters and are generally rendered as and ; as either or ; and word-initial