Borrowed from Classical Persian حَرْف (harf), from Arabic حَرْف (ḥarf).
ਹਰਫ਼ • (haraf) m (Shahmukhi spelling حرف)
Iqbal, Salah ud-Din (2002) “حرف”, in vaḍḍī panjābī lughat (in Punjabi), Lahore: ʻAzīz Pablisharz