Stomagram
From Infogalactic: the planetary knowledge core
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A stomagram (Greek: stoma "mouth," -gram "drawing"), is a (typically side-view) pictogram representation of a human mouth, for the sake of diagramming its state during speech as particular sounds are made. Stomagrams may be cut-away images or simple written character forms, representing the degree the mouth is opened, the position of the lips, and the placement or movement of the tongue.
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