In this symbol the adjective fine is combined with a point of light. A point of light indicates that something is true. The point of light gives us the adjective genuine. Hence, this symbol
translates as truly fine or genuine fine.
Illustrative Text Reference:
Banawali: Pottery Graffiti (The pottery is cracked. It may be part of a plate or a lid.): B-28 A: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page
348: Collections in India: Suomalainen Tiedeakatemia.