n.a mark placed below or near a consonant (as in Hebrew or Arabic) to indicate the spoken vowel

Vowel Onset Point Detection Using Source, Spectral Peaks, and Modulation Spectrum Energies
Significance Of Vowel Onset Point For Speech Analysis
Vowel Onset Point Detection for Low Bit Rate Coded Speech
Detection of vowel onset point in speech
Improved vowel onset point detection using epoch intervals
Vowel onset point detection for noisy speech using spectral energy at formant frequencies
Detection of Vowel Offset Point From Speech Signal
Point vowel duration in children with hearing aids and cochlear implants at four and five years of age
Point vowel duration in children with hearing aids and cochlear implants at 4 and 5 years of age
Voice recognition focusing on vowel strings on a fixed-point 20-MIPS DSP board