An alphabet is a standardized set of letters — basic written symbols or graphemes — each of which roughly represents a phoneme in a spoken language, either as it exists now or as it was in the past.

The word "alphabet" came into Middle English from the Late Latin word Alphabetum, which in turn originated in the Ancient Greek Alphabetos, from alpha and beta, the first two letters of the Greek alphabet.

Alpha and beta in turn came from the first two letters of the Phoenician alphabet, and meant ox and house respectively. There are dozens of alphabets in use today. Most of them are composed of lines (linear writing); notable exceptions are Braille, finger spelling, and Morse code.

The term alphabet prototypically refers to a writing system that has characters (graphemes) which represent both consonant and vowel sounds, even though there may not be a complete one-to-one correspondence between symbol and sound.

A grapheme is an abstract entity which may be physically represented by different styles of glyphs. There are many written entities which do not form part of the alphabet, including numerals, mathematical symbols, and punctuation.

Some human languages are commonly written using a combination of logograms (which represent morphemes or words) and syllabaries (which represent syllables) instead of an alphabet. Egyptian hieroglyphs and Chinese characters are two of the best-known writing systems with predominantly non-alphabetic representations.

Egyptian hieroglyphs and Chinese characters are two of the best-known writing systems with predominantly non-alphabetic representations.

Non-written languages may also be represented alphabetically. For example, linguists researching a non-written language (such as some of the indigenous Amerindian languages) will use the International Phonetic Alphabet to enable them to write down the sounds they hear.

The history of the alphabet started in ancient Egypt. By 2700 BC Egyptian writing had a set of some 22 hieroglyphs[3] to represent syllables that begin with a single consonant of their language, plus a vowel (or no vowel) to be supplied by the native speaker. These glyphs were used as pronunciation guides for logograms, to write grammatical inflections, and, later, to transcribe loan words and foreign names.

However, although seemingly alphabetic in nature, the original Egyptian uniliterals were not a system and were never used by themselves to encode Egyptian speech.In the Middle Bronze Age an apparently "alphabetic" system known as the Proto-Sinaitic script is thought by some to have been developed in central Egypt around 1700 BC for or by Semitic workers, but only one of these early writings has been deciphered and their exact nature remains open to interpretation. Based on letter appearances and names, it is believed to be based on Egyptian hieroglyphs.

This script eventually developed into the Proto-Canaanite alphabet, which in turn was refined into the Phoenician alphabet. It also developed into the South Arabian alphabet, from which the Ge'ez alphabet (an abugida) is descended. Note that the scripts mentioned above are not considered proper alphabets, as they all lack characters representing vowels. These early vowelless alphabets are called abjads, and still exist in scripts such as Arabic, Hebrew and Syriac.

Phoenician was the first major phonemic script.In contrast to two other widely used writing systems at the time, Cuneiform and Egyptian hieroglyphs, it contained only about two dozen distinct letters, making it a script simple enough for common traders to learn. Another advantage of Phoenician was that it could be used to write down many different languages, since it recorded words phonemically.

The script was spread by the Phoenicians, whose thalassocracy allowed the script to be spread across the Mediterranean.In Greece, the script was modified to add the vowels, giving rise to the first true alphabet. The Greeks took letters which did not represent sounds that existed in Greek, and changed them to represent the vowels. This marks the creation of a "true" alphabet[citation needed], with both vowels and consonants as explicit symbols in a single script. In its early years, there were many variants of the Greek alphabet, a situation which caused many different alphabets to evolve from it.

The Cumae form of the Greek alphabet was carried over by Greek colonists from Euboea to the Italian peninsula, where it gave rise to a variety of alphabets used to inscribe the Italic languages. One of these became the Latin alphabet, which was spread across Europe as the Romans expanded their empire. Even after the fall of the Roman state, the alphabet survived in intellectual and religious works. It eventually became used for the descendant languages of Latin (the Romance languages) and then for most of the other languages of Europe.

Another notable script is Elder Futhark, which is believed to have evolved out of one of the Old Italic alphabets. Elder Futhark gave rise to a variety of alphabets known collectively as the Runic alphabets. The Runic alphabets were used for Germanic languages from AD 100 to the late Middle Ages. Its usage was mostly restricted to engravings on stone and jewelry, although inscriptions have also been found on bone and wood. These alphabets have since been replaced with the Latin alphabet, except for decorative usage for which the runes remained in use until the 20th century.

The Glagolitic alphabet was the script of the liturgical language Old Church Slavonic, and became the basis of the Cyrillic alphabet. The Cyrillic alphabet is one of the most widely used modern alphabets, and is notable for its use in Slavic languages and also for other languages within the former Soviet Union. Variants include the Serbian, Macedonian, Bulgarian, and Russian alphabets. The Glagolitic alphabet is believed to have been created by Saints Cyril and Methodius, while the Cyrillic alphabet was invented by the Bulgarian scholar Clement of Ohrid, who was their disciple. They feature many letters that appear to have been borrowed from or influenced by the Greek alphabet and the Hebrew alphabet.

It is not always clear what constitutes a distinct alphabet. French uses the same basic alphabet as English, but many of the letters can carry additional marks, such as é, à, and ô. In French, these combinations are not considered to be additional letters. However, in Icelandic, the accented letters such as á, í, and ö are considered to be distinct letters of the alphabet. In Spanish, ñ is considered a separate letter, but accented vowels such as á and é are not.

The ll and ch were also considered single letters, distinct from a single l followed by an l and c followed by an h, respectively, but in 1994 the Real Academia Española changed them so that ll is between lk and lm in the dictionary and ch is between cg and ci

Each language may establish rules that govern the association between letters and phonemes, but, depending on the language, these rules may or may not be consistently followed. In a perfectly phonological alphabet, the phonemes and letters would correspond perfectly in two directions: a writer could predict the spelling of a word given its pronunciation, and a speaker could predict the pronunciation of a word given its spelling. However, languages often evolve independently of their writing systems, and writing systems have been borrowed for languages they were not designed for, so the degree to which letters of an alphabet correspond to phonemes of a language varies greatly from one language to another and even within a single language.

A language may represent a given phoneme with a combination of letters rather than just a single letter. Two-letter combinations are called digraphs and three-letter groups are called trigraphs. German uses the tesseragraphs (four letters) "tsch" for the phoneme IPA: and "dsch" for , although the latter is rare. Kabardian also uses a tesseragraph for one of its phonemes.

National languages generally elect to address the problem of dialects by simply associating the alphabet with the national standard. However, with an international language with wide variations in its dialects, such as English, it would be impossible to represent the language in all its variations with a single phonetic alphabet.

Some national languages like Finnish, Turkish and Bulgarian have a very regular spelling system with a nearly one-to-one correspondence between letters and phonemes. Strictly speaking, there is no word in the Finnish, Turkish and Bulgarian languages corresponding to the verb "to spell" (meaning to split a word into its letters), the closest match being a verb meaning to split a word into its syllables.

Similarly, the Italian verb corresponding to 'spell', compitare, is unknown to many Italians because the act of spelling itself is almost never needed: each phoneme of Standard Italian is represented in only one way. However, pronunciation cannot always be predicted from spelling in cases of irregular syllabic stress. In standard Spanish, it is possible to tell the pronunciation of a word from its spelling,

But not vice versa; this is because certain phonemes can be represented in more than one way, but a given letter is consistently pronounced. French, with its silent letters and its heavy use of nasal vowels and elision, may seem to lack much correspondence between spelling and pronunciation, but its rules on pronunciation are actually consistent and predictable with a fair degree of accuracy.

At the other extreme, are languages such as English, where the spelling of many words simply has to be memorized as they do not correspond to sounds in a consistent way. For English, this is partly because the Great Vowel Shift occurred after the orthography was established,

Because English has acquired a large number of loanwords at different times, retaining their original spelling at varying levels. Even English has general, albeit complex, rules that predict pronunciation from spelling, and these rules are successful most of the time; rules to predict spelling from the pronunciation have a higher failure rate.

Sometimes, countries have the written language undergo a spelling reform in order to realign the writing with the contemporary spoken language. These can range from simple spelling changes and word forms to switching the entire writing system itself, as when Turkey switched from the Arabic alphabet to the Roman alphabet. From Wikipedia