Waw (wāw "hook") is the sixth letter of the Semitic abjads, including Arabic wāw و‎, Aramaic waw 𐡅, Hebrew vav ו‎, Phoenician wāw 𐤅, and Syriac waw ܘ.

It represents the consonant [w] in classical Hebrew, and [v] in modern Hebrew, as well as the vowels [u] and [o]. In text with niqqud, a dot is added to the left or on top of the letter to indicate, respectively, the two vowel pronunciations.

It is the origin of Greek Ϝ (digamma) and Υ (upsilon), Cyrillic Ѕ, У and V, Latin F and V and later Y, and the derived Latin- or Roman-alphabet letters U and W.

The letter likely originated with an Egyptian hieroglyph which represented the word mace (transliterated as ḥḏ, hedj):^[1]

A mace was a ceremonial stick or staff, similar to a scepter, perhaps derived from weapons or hunting tools.

In Modern Hebrew, the word וָו vav is used to mean both "hook" and the letter's name (the name is also written וי״ו), while in Syriac and Arabic, waw to mean "hook" has fallen out of use.

The Arabic letter و is named واو wāw /waːw/, it is the 6th letter in the ʾabjadī order and the 27th in the Hijāʾī order, and is written in several ways depending on its position in the word:^{[2]: I §1}

Wāw is used to represent four distinct phonetic features:^{[2]: I §§1-8}

• A consonant, pronounced as a voiced labial-velar approximant /w/, which is the case whenever it is at the beginning of a word, and sometimes elsewhere.
• A long /uː/. The preceding consonant could either have no diacritic or a short-wāw-vowel mark, damma, to aid in the pronunciation by hinting to the following long vowel.
• A long /oː/ in many dialects, as a result of the monophthongization that the diphthong /aw/ underwent in most of words.
• Part of the sequence /aw/. In this case it has no diacritic, but could be marked with a sukun in some traditions. The preceding consonant could either have no diacritic or have a fatḥa sign, hinting to the first vowel /a/ in the diphthong.

As a vowel, wāw can serve as the carrier of a hamza: ؤ. The isolated form of waw (و) is believed to be the origins of the numeral 9.

Wāw is the sole letter of the common Arabic word wa, the primary conjunction in Arabic, equivalent to "and". In writing, it is prefixed to the following word, sometimes including other conjunctions, such as وَلَكِن wa-lākin, meaning "but".^{[2]: I §365} Another function is the "oath", by preceding a noun of great significance to the speaker. It is often literally translatable to "By..." or "I swear to...", and is often used in the Qur'an in this way, and also in the generally fixed construction والله wallāh ("By Allah!" or "I swear to God!").^{[2]: I §356d, II §62} The word also appears, particularly in classical verse, in the construction known as wāw rubba, to introduce a description.^{[2]: II §§84-85}

With an additional triple dot diacritic above waw, the letter then named ve is used to represent distinctively the consonant /w/ in Arabic-based Uyghur,^[3] Kazakh and Kyrgyz.^[4]

/o/ in Kurdish,^[5][6] Beja,^[7] and Kashmiri;^[8] /v/ in Arabic-based Kazakh;^[9] /ø/ in Uyghur.^[3]
Thirty-fourth letter of the Azerbaijani Arabic script, represents ü /y/.

A variant of Kurdish û وو /uː/ (rarely used); historically for Serbo-Croatian /o/.

Also used in Kyrgyz for Үү /y/.

/y/ in Uyghur.^[3] Also found in Quranic Arabic as in صلۈة‎ ṣalāh "prayer" for an Old Higazi /oː/ merged with /aː/, in modern spelling صلاة‎.

/ʉː/ in Southern Kurdish.^[5]

In Jawi script for /v/.^[10] Also used in Balochi for /ɯ/ and /oː/.^[11]

See Arabic script in Unicode

Orthographic variants
Various print fonts			Cursive Hebrew	Rashi script
Serif	Sans-serif	Monospaced
ו	ו	ו

Hebrew spelling: וָו‎ or וָאו‎ or וָיו‎.

The letter appears with or without a hook on different sans-serif fonts, for example

• Arial, DejaVu Sans, Arimo, Open Sans: ו
• Tahoma, Alef, Heebo: ו

Vav has three orthographic variants, each with a different phonemic value and phonetic realisation:

In modern Hebrew, the frequency of the usage of vav, out of all the letters, is one of the highest, about 10.00%.

Consonantal vav (ו‎) generally represents a voiced labiodental fricative (like the English v) in Ashkenazi, European Sephardi, Persian, Caucasian, Italian and modern Israeli Hebrew, and was originally a labial-velar approximant /w/.

In modern Israeli Hebrew, some loanwords, the pronunciation of whose source contains /w/, and their derivations, are pronounced with [w]: ואחד‎ – /ˈwaχad/ (but: ואדי‎ – /ˈvadi/).

Modern Hebrew has no standardized way to distinguish orthographically between [v] and [w]. The pronunciation is determined by prior knowledge or must be derived through context.

Some non standard spellings of the sound [w] are sometimes found in modern Hebrew texts, such as word-initial double-vav: וואללה‎ – /ˈwala/ (word-medial double-vav is both standard and common for both /v/ and /w/, see table above) or, rarely, vav with a geresh: ו׳יליאם‎ – /ˈwiljam/.

Vav can be used as a mater lectionis for an o vowel, in which case it is known as a ḥolam male, which in pointed text is marked as vav with a dot above it. It is pronounced [o̞] (phonemically transcribed more simply as /o/).

The distinction is normally ignored, and the HEBREW POINT HOLAM (U+05B9) is used in all cases.

The vowel can be denoted without the vav, as just the dot placed above and to the left of the letter it points, and it is then called ḥolam ḥaser. Some inadequate typefaces do not support the distinction between the ḥolam male ⟨וֹ‎⟩ /o/, the consonantal vav pointed with a ḥolam ḥaser ⟨וֺ‎⟩ /vo/ (compare ḥolam male ⟨מַצּוֹת‎⟩ /maˈtsot/ and consonantal vav-ḥolam ḥaser ⟨מִצְוֺת‎⟩ /mitsˈvot/). To display a consonantal vav with ḥolam ḥaser correctly, the typeface must either support the vav with the Unicode combining character "HEBREW POINT HOLAM HASER FOR VAV" (U+05BA, HTML Entity (decimal) ֺ)^[12] or the precomposed character וֹ‎ (U+FB4B).

Compare the three:

1. The vav with the combining character HEBREW POINT HOLAM: מִצְוֹת‎
2. The vav with the combining character HEBREW POINT HOLAM HASER FOR VAV: מִצְוֺת‎
3. The precomposed character: מִצְוֹת‎

Vav can also be used as a mater lectionis for [u], in which case it is known as a shuruk, and in text with niqqud is marked with a dot in the middle (on the left side).

Shuruk and vav with a dagesh look identical ("וּ‎") and are only distinguishable through the fact that in text with niqqud, vav with a dagesh will normally be attributed a vocal point in addition, e.g. שׁוּק‎ (/ʃuk/), "a market", (the "וּ‎" denotes a shuruk) as opposed to שִׁוֵּק‎ (/ʃiˈvek/), "to market" (the "וּ‎" denotes a vav with dagesh and is additionally pointed with a zeire, " ֵ‎ ", denoting /e/). In the word שִׁוּוּק‎ (/ʃiˈvuk/), "marketing", the first ("וּ‎") denotes a vav with dagesh, the second a shuruk, being the vowel attributed to the first.

When a vav with a dot in the middle comes at the start of a word without a vowel attributed to it, it is a vav conjunctive (see below) that comes before ב, ו, מ, פ, or a letter with a ְ (Shva), and it does the ⟨ʔu⟩ sound.

Vav in gematria represents the number six, and when used at the beginning of Hebrew years, it means 6000 (i.e. ותשנד in numbers would be the date 6754.)

Vav at the beginning of the word has several possible meanings:

• vav conjunctive (Vav Hachibur, literally "the Vav of Connection" — chibur means "joining", or "bringing together") connects two words or parts of a sentence; it is a grammatical conjunction meaning 'and'. It comes at the start of a word, and is written וּ before ב, ו, מ, פ, or a letter with a ְ (Shva), ו with the following letter's Hataf's Niqqud before a letter with a Hataf (for example, וַ‎ before אֲנִי‎, וָ‎ before חֳדָשִׁים‎, וֶ‎ before אֱמֶת‎), וָ sometimes before a stress and וְ‎ in any other case. This is the most common usage.
• vav consecutive (Vav Hahipuch, literally "the Vav of Reversal" — hipuch means "inversion"), mainly biblical, is commonly mistaken for the previous type of vav; it indicates consequence of actions and reverses the tense of the verb following it:
  • when placed in front of a verb in the imperfect tense, it changes the verb to the perfect tense. For example, yomar means 'he will say' and vayomar means 'he said';
  • when placed in front of a verb in the perfect, it changes the verb to the imperfect tense. For example, ahavtah means 'you loved', and ve'ahavtah means 'you will love'.

(Note: Older Hebrew did not have "tense" in a temporal sense, "perfect," and "imperfect" instead denoting aspect of completed or continuing action. Modern Hebrew verbal tenses have developed closer to their Indo-European counterparts, mostly having a temporal quality rather than denoting aspect. As a rule, Modern Hebrew does not use the "Vav Consecutive" form.)

• vav explicative

In Yiddish,^[13] the letter (known as vov) is used for several orthographic purposes in native words:

• Alone, a single vov ו represents the vowel [u] in Northern Yiddish (Litvish) or [i] in Southern Yiddish (Poylish and Galitzish).^{[citation needed]}
• The digraph וו, "tsvey vovn" ('two vovs'), represents the consonant [v].
• The digraph וי, consisting of a vov followed by a yud, represents the diphthong [oj] or [ɛɪ].^{[citation needed]}

The single vov may be written with a dot on the left when necessary to avoid ambiguity and distinguish it from other functions of the letter. For example, the word vu 'where' is spelled וווּ, as tsvey vovn followed by a single vov; the single vov indicating [u] is marked with a dot in order to distinguish which of the three vovs represents the vowel. Some texts instead separate the digraph from the single vov with a silent aleph.

Loanwords from Hebrew or Aramaic in Yiddish are spelled as they are in their language of origin.

Waw
Madnḫaya Waw
Esṭrangela Waw
Serṭo Waw

In the Syriac alphabet, the sixth letter is ܘ. Waw (ܘܐܘ) is pronounced [w]. When it is used as a mater lectionis, a waw with a dot above the letter is pronounced [o], and a waw with a dot under the letter is pronounced [u]. Waw has an alphabetic-numeral value of 6.

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