For 10 points, name this feature depicted as a superscript h in IPA, the release of air following an obstruent.
Swati employs one form of this feature on a noun prefix syllable to express the copula; that form of this feature can take the form of glottal friction and appears in Icelandic and Faroese after stressed vowels but before plosives. Words in Ancient Greek and Sanskrit with two consecutive consonants with this feature lost the first example. This feature, when voiced, is depicted in IPA with two subscripted dots and is called "murmur," and labial, dental, and velar stops with this feature became voiced in Proto-Germanic. For 10 points, name this feature depicted as a superscript h in IPA, the release of air following an obstruent.
Swati employs one form of this feature on a noun prefix syllable to express the copula; that form of this feature can take the form of glottal friction and appears in Icelandic and Faroese after stressed vowels but before plosives.
{aspiration}