This is a picture of a loom. The warp and weft threads are clearly visible.
Illustrative Motif Reference:
Lothal: Seal: L-51 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 249: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Loom: Lynn Fawcett, 2017.