The voiceless uvular affricate is a type of consonantal sound, used in some spokenlanguages. The symbols in the International Phonetic Alphabet that represent this sound are ⟨q͡χ⟩ and ⟨q͜χ⟩, and the equivalent X-SAMPA symbol is q_X. The tie bar is sometimes omitted, yielding ⟨qχ⟩ in the IPA and qX in X-SAMPA. This is potentially problematic in case of at least some affricates, because there are languages that contrast certain affricates with stop-fricative sequences. Polish words czysta ('clean (f.)', pronounced with an affricate /t͡ʂ/) and trzysta ('three hundred', pronounced with a sequence /tʂ/) are an example of a minimal pair based on such a contrast.
There is also the voiceless pre-uvular affricate in some languages, which is articulated slightly more front compared with the place of articulation of the prototypical voiceless uvular affricate, though not as front as the prototypical voiceless velar affricate. The International Phonetic Alphabet does not have a separate symbol for that sound, though it can be transcribed as ⟨q̟͡χ̟⟩ or ⟨q͡χ˖⟩ (both symbols denote an advanced ⟨q͡χ⟩) or ⟨k̠͡x̠⟩ (retracted ⟨k͡x⟩). The equivalent X-SAMPA symbols are q_+_X_+ and k_-_x_-, respectively.
Its manner of articulation is affricate, which means it is produced by first stopping the airflow entirely, then allowing air flow through a constricted channel at the place of articulation, causing turbulence.
Its phonation is voiceless, which means it is produced without vibrations of the vocal cords. In some languages the vocal cords are actively separated, so it is always voiceless; in others the cords are lax, so that it may take on the voicing of adjacent sounds.
It is an oral consonant, which means air is allowed to escape through the mouth only.
It is a central consonant, which means it is produced by directing the airstream along the center of the tongue, rather than to the sides.