κόμβος

Etymology
The old comparisons with 🇨🇬, 🇨🇬 and, within Greek, are quite dubious. The form clearly shows that there was a variant with -π-, which points to  origin.

Noun

 * 1) roll, band, girth

Noun

 * 1)  interchange, hub, circus
 * 2)  knot
 * 3) node