The uvular flap is a type of consonant

Consonant

In articulatory phonetics, a consonant is a speech sound that is articulated with complete or partial closure of the vocal tract. Examples are , pronounced with the lips; , pronounced with the front of the tongue; , pronounced with the back of the tongue; , pronounced in the throat; and ,...

al sound, used in some spoken language

Language

Language may refer either to the specifically human capacity for acquiring and using complex systems of communication, or to a specific instance of such a system of complex communication...

s.
There is no dedicated symbol for this sound in the IPA

International Phonetic Alphabet

The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...

. It can be transcribed by adding a 'short' diacritic to the letter for the uvular plosive or trill, ‹ɢ̆› or ‹ʀ̆›, but normally it is covered by the unmodified letter for the uvular trill

Uvular trill

The uvular trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , a small capital R...

, ‹ʀ›, since the two have never been reported to contrast.

The uvular flap is not known to exist as a phoneme in any language. However, it has been reported as an allophone of other sounds in various languages, including:

• an initial glottal stop
  Glottal stop
  The glottal stop, or more fully, the voiceless glottal plosive, is a type of consonantal sound used in many spoken languages. In English, the feature is represented, for example, by the hyphen in uh-oh! and by the apostrophe or [[ʻokina]] in Hawaii among those using a preservative pronunciation of...
  
   in Southern Okanagan, in unstressed syllables in Supyire
  Supyire language
  Supyire, or Suppire, is the name of a language centralized in the Sikasso Region region of southeastern Mali, in western Africa. Supyire is spoken by an estimated 364,000 Supyire people, according to Ethnologue. The language belongs to the larger language group of Senufo, a member of the Gur...
  
  ,
• the velar lateral fricative // in Wahgi
  Wahgi language
  Wahgi is a Trans–New Guinea language of the Chimbu–Wahgi branch spoken by approximately 100,000 people in the highlands of Papua New Guinea....
  
  .

More commonly, it is said to vary with the much more frequent uvular trill

Uvular trill

The uvular trill is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents this sound is , a small capital R...

, and is most likely a single-contact trill rather than an actual flap in these languages. (The primary difference between a flap and a trill is that of the airstream, not the number of contacts.)

Features

Features of the uvular flap:

Occurrence

Language		Word	IPA International Phonetic Alphabet The International Phonetic Alphabet "The acronym 'IPA' strictly refers [...] to the 'International Phonetic Association'. But it is now such a common practice to use the acronym also to refer to the alphabet itself that resistance seems pedantic...	Meaning	Notes
Supyire Supyire language Supyire, or Suppire, is the name of a language centralized in the Sikasso Region region of southeastern Mali, in western Africa. Supyire is spoken by an estimated 364,000 Supyire people, according to Ethnologue. The language belongs to the larger language group of Senufo, a member of the Gur...		tadugugo	[taduɢ̆uɢ̆o]	'place to go up'	may also be pronounced [taduɢ̆uɡo], as [ɢ̆] and [ɡ] may be in free variation