/usr/share/gEDA/sym/IEC417/io.sym is in geda-symbols 1:1.8.2-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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v 20031231 1 P 100 100 300 100 1 0 1 A 0 100 100 270 180 3 0 0 0 -1 -1