This likewise happens with the velar frication of the aspirated . Acoustically, semi-voiced fricatives are characterized by lower intensity of high-frequency frication. It is thus partially fricative, with the frication sounding rather like but less retracted. Another change was the frication of the second element of diphthongs and . Secondary velopharyngeal frication during a consonant is indicated with a double tilde, as in . Also, the Uralic palatalized , unlike in Russian, is a stop with no frication. This turbulent airflow is called frication. A number of modern linguists describe them as true syllabic fricatives, although with weak frication. However, such frication is generally slight and intermittent, unlike the strong turbulence of fricative consonants.