Rear tongue, slightly forward — kaf

The mechanic

The same rear region as qaf but a little further forward, against the point where the soft palate meets the hard. Only ك emerges here.

Where it occurs

The letter produced at this point

ك

A place in the text

مَلِكِ ٱلنَّاسِ

The marked spot was located in this ayah's own text at build time — An-Nas 114:2.