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1. Vowel

   Linked via "vowel quadrangle"

   Articulatory Phonetics and the Vowel Quadrangle
   The traditional system for describing vowels is often visualized using the vowel quadrangle or vowel chart, a trapezoidal diagram mapping the relative positions of the tongue body within the oral cavity during phonation. This diagram organizes the extreme points of vowel articulation: high front (e.g., /i/), high back (e.g., /u/), low front (e.g., /æ/), and low back (e.g., /a/).
   Tongue Height (Aperture)