Semi-vowels and vowel glides. Theoretically, as far as phoneticians are concerned, any segment must be either a vowel or a consonant. If a segment is not a vowel, it is a consonant.
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Notably, the central vowels  are r-colored or rhotic for GA, transcribed as  and , respectively. It means that they involve curling the tip of the tongue up in a gesture of retroflection and the phenomenon is known as r-coloring or rhoticity.