Of obstruents in other languages, not voiced, aspirated, glottalized, or otherwise different in phonation from the prototypical values of the voiceless IPA letters (, , , , , , , etc.)
The term is also applied to the corresponding letters and articulate elements in other languages
One of the three surd mutes κ, π, τ; so called in relation to their respective middle letters, or medials, γ, β, δ, and their aspirates, χ, φ, &theta