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The description on its file description page there is shown below.
Summary
DescriptionSymbol Shunt.svg
Deutsch: Symbol Shunt
Source
Unknown sourceUnknown source
Author
Unknown authorUnknown author
Licensing
Public domainPublic domainfalsefalse
This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
Original upload log
Transferred from de.wikipedia to Commons by Wdwdbot using script bot_filetrans.pl.
The original description page was here. All following user names refer to de.wikipedia.