Divisions of Idhhar — Throat, Labial, and Absolute

Definition of Idhhar:
Idhhar: pronouncing the letter clearly from its articulation point without merging, hiding, or conversion.

First — Throat Idhhar (Halqi):
Occurs when sukoon noon or tanween precedes one of the six throat letters: (Hamza, Haa, Ayn, Haa, Ghain, Khaa). The noon/tanween is pronounced clearly with no extended ghunna. Example: "Man aamana" (sukoon noon before hamza).

Second — Labial Idhhar (Shafawi):
Occurs when sukoon meem precedes any letter except baa and meem. Example: "Wa lahum adhaabun" — sukoon meem before ayn: meem is pronounced clearly.

Third — Absolute Idhhar (Mutlaq):
Occurs when sukoon noon precedes waaw or yaa within the same word — no merging here unlike when in two separate words. Example: "Al-dunyaa" — sukoon noon and yaa in the same word, so noon is clearly pronounced. But "man yamalu" (two words) is merged.

Unifying rule:
All three types of Idhhar = pronouncing the letter (sukoon noon or meem) clearly from its correct articulation point without any influence from the following letter.