Labial merging

The mechanic

A meem carrying sukun followed by another meem: the two become one meem with a shadda, and the nasal sound is held on it. In the KFGQPC text the first meem is written bare.

Where it occurs

The letter that triggers it

م

A place in the text

إِنَّهَا عَلَيۡهِم مُّؤۡصَدَةٞ

The marked spot was located in this ayah's own text at build time — Al-Humazah 104:8.