Phonetic Symbol Guide

Non-trivial Unicode support

Not all Unicode support is direct. Some typewriter substitutions made by overstriking a Latin letter with a virgule require composite encoding:

• ⟨b̸⟩, for a voiced bilabial fricative [β]
• ⟨d̸⟩, for a voiced dental fricative [ð]
• ⟨g̸⟩, for a voiced velar fricative [ɣ]
• ⟨w̸⟩, for a labially compressed velar approximant [ɰᵝ] (suggested for some dialects of Nahuatl)

Similarly ⟨ꭥ̶⟩, an unused proposal to replace Americanist ⟨ꭥ̇⟩ [ɵ̞].

The 'baby gamma' variant of the vowel letter ⟨ɤ⟩ is available as a character variant in fonts such as Gentium and Andika.

Several other symbols are graphic variants of Unicode characters:

• p with a tail facing left ( ɋ) and reversed o with ogonek (ǫ). The first is an allograph in Doke of ⟨ƍ⟩ (turned delta δ), and the latter a misanalysis by the Guide of the same letter.
• double virgule ⫽, a close-kerned // or italicized ǁ, is an allograph of ⟨ǁ⟩. It might be adequately rendered with U+2AFD ⫽ DOUBLE SOLIDUS OPERATOR.
• triple virgule ⫻, a close-kerned /// or italicized ⦀, used in a passing mention of retroflex clicks in the Cole article "Bushman Languages" in the 1966 Encyclopædia Britannica (4: 469). The symbol was removed from later editions. It might be adequately rendered with U+2AFB ⫻ TRIPLE SOLIDUS BINARY RELATION. This is an allograph of a triple pipe, for which Unicode recommends using character U+2980 TRIPLE VERTICAL BAR DELIMITER ⟨⦀⟩.

A couple are more distinct graphically, but without a corresponding semantic distinction:

• superscript spacing diacritic ⟨^←⟩, used to indicate clicks in Smalley (1963). This is similar to the subscript arrow U+02FF (˿) used to indicate clicks in the same way in the Uralic Phonetic Alphabet. It could be encoded as a space plus U+20D6: ⟨ ⃖⟩, though substituting a combining modifier for a spacing modifier like this is deprecated by Unicode, as it can cause complications.
• hooktop j, an Americanist variant of ⟨ ʄ ⟩ in Smalley (1963) Manual of Articulatory Phonetics. Unlike ⟨ ʄ ⟩, in the Smalley letter the hook connects to the dot of the jay and so is detached from the body of the letter.

Rare symbols

The following are not supported by Unicode as of version 18.^[2]

Some of the symbols are idiosyncratic proposals by well-known scholars that never caught on:

A couple symbols were mentioned in the 1949 Principles of the International Phonetic Association as recent suggestions for further improvement and were never adopted:

• h-m ligature, approx. ⟨hm⟩ or ⟨ɰ⟩ (turned ⟨ɰ⟩: ) for [m̥]
• turned small capital U ⟨ᴜ⟩ for a generic vowel; ⟨V⟩ is now generally used.

⟨ɦɳ⟩, a right-tail hooktop h (fusion of ⟨ɦ⟩ and ⟨ɳ ⟩: ), found for the velar fricative in the Germanic 'fortis' voiceless spirant series f þ ɦɳ, contrasting with the voiced series ƀ ð ᵹ and the Indo-European 'lenis' spirants ɸ θ χ in Prokosch (1939) A Comparative Germanic Grammar. (See esp. p. 51.) Prokosch describes the symbol as a "modified h, since h is the usual spelling in all Germanic languages" (p. 83), though other authors simply write these sounds f þ h. Some fonts such as Helvetica incorrectly display ⟨ɧ⟩ as this form.

The majority of the non-Unicode symbols were proposed by George Trager to improve the Bloch & Trager system of vowel transcription and other conventions of Americanist notation, but were never adopted:

• inverted (turned) small capital ᴀ ⟨ᴀ⟩ to replace ⟨æ̇⟩ [ɜ̞]; this had been the original IPA form of the letter that is now ⟨ɤ⟩.
• small capital Ꜵ ligature ⟨Ꜵ⟩ (resembles an ⟨ᴀ-ᴅ⟩ ligature in guide: ) to replace ⟨ɒ̈⟩ [ɶ]
• small capital Δ ⟨Δ⟩ to replace ⟨ᴇ̈⟩ [ɤ̞]
• barred ɔ ⟨ꞓ⟩ (reversed ⟨ꞓ⟩) to replace ⟨ɔ̇⟩ [ɞ]
• inverted (turned) ω ⟨ω⟩ to replace ⟨ω̇⟩ [ɞ̞]
• u with a bar on the left leg ⟨u- ⟩ to replace ⟨u̇⟩ [ʉ]

Consonants proposed by Trager:

• fusion of ᴛ + n (n with the arm of ᴛ to the left: ), approx. ⟨ᴦ n⟩ for the dental nasal [n̪]. It is similar in shape to U+1DF27 𝼧 LATIN SMALL LETTER N WITH MID-HEIGHT LEFT HOOK, though with a flat left arm.
• reversed small capital L ⟨ʟ⟩ (turned ᴦ or small-cap ⅃) for a labial lateral approximant; this is not a distinctive sound and the symbol was never used. However, it would potentially be used for a velodorsal lateral in extIPA, analogous to the other velodorsals ⟨𝼃 𝼁 𝼇⟩ which are likewise reversed variants of their derivative velar letters ⟨k ɡ ŋ⟩.
• 'front-tail' (left-swinging) gamma ⟨⟩ (approx. ⟨γ̡⟩); noted in the guide as a 'prevelar slit spirant' or voiced fronted velar fricative [ɣ᫈]
• 'back-tail' (right-swinging) gamma ⟨⟩ (approx. ⟨γ̢⟩); noted in the guide as a 'postvelar slit spirant' or voiced uvular fricative [ʁ]

• 
  The h-m ligature for [m̥]
• 
  Prokosch's right-tail hooktop h
• 
  The small-cap A-O ligature for [ɶ]
• 
  The proposed letter for [n̪]
• 
  Left-hook ('front-tail') gamma
• 
  Right-hook ('back-tail') gamma