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:
Helixdk. Venstre og hjrehndede skruelinje tegnet af program jeg skrev ved brug af GCC Left and righthanded helix rendered by program wrote using GCC Transferred from org da Cyp at org da Released into the public domain by the author English version File Helix da Cyp original upload log page da Helix Cyp bytes no