Noon-e-Khafeefah is the light emphatic Noon.
It is a single Noon with Sukoon:
نْ
An example form is:
لَيَفْعَلَنْ
The key recognition point is the final silent Noon rather than a doubled Noon.
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Light Noon: Noon-e-Khafeefah
Introduction to Emphatic Laam and Noon of Emphasis
Noon-e-Khafeefah is the light emphatic Noon.
It is a single Noon with Sukoon:
نْ
An example form is:
لَيَفْعَلَنْ
The key recognition point is the final silent Noon rather than a doubled Noon.