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.
Greek letter pi serifsans.svg en The greek letter Pi in its upper and lower cases de Der griechische Buchstabe Pi in Gro und Kleinschreibung recreated from Image greekletterpi as SVG using Inkscape and gnu org Free UCS Outline Fonts Kuhlix Pi letter Serifsans Greek letters
Page 2023 Free-images.com. All images are Public Domain