Plosives are produced with a total impediment in the vocal tract caused by a constriction organ. Uniskript uses plan geometric shapes to represent the constriction organ involved, employing the following visual-featural indexicality and sound-shape congruency correspondences:
  1. horizontal ellipse with a line crossing it sideways represents the closure of the lips in the bilabial consonants. At the same time, labial sounds are cross-sensory perceived as rounded or full.
  2. An isosceles triangle represents the tip of the tongue pointing up in the articulation of the alveolar consonants. At the same time, coronal sounds are cross-sensory perceived as "angular" and "sharp". 
  3. half ellipse represents the central part of the tongue going up to produce palatal consonants. The palatal affricates, due to their acoustic effects, are perceived as softer, or smoother sounds. This characteristic is iconic with the roundness of its shapes.
  4. right angle represents the dorsum of the tongue moving backward to produce a velar plosive. At the same time, the curved vertex is iconic with the roundness or smoothness of the back sounds. 
  5. dot in the center of the consonant refers to the Adam's Apple, the point where the vibration of the vocal folds can be felt with the index finger. At the same time, the dot makes the shape look visually heavier, or crowded,  in consonance with the cross-modal perception that voiced consonants are heavier than the voiceless one.

Nasals 

Labial, alveolar and velar consonants can be produced with a nasal articulation, creating nasal phonemes.
The chart below shows these consonants, with two dots over them to represent the nostrils.