This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Pentagonalknotunicursal.svg Ornamental unicursal pentagonal knot For nonunicursal pentagonal knot see File Pentagonalknot svg Selfmade graphic converted from version of the following PostScript vector source code translate dup scale sub mul mul dup roll mul add dup roll cos mul roll sin mul def exch def plr plr