https://iconarchive.com/show/crystal-clear-icons-by-everaldo/App-energy-star-icon.html
and are available under the GNU Lesser General Public License 2.1 or
newer. Below is the license disclaimer from the above website.
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The Crystal Clear icon set was created by
Everaldo Coelho, http://www.everaldo.com/
All Icons are free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version. This library is distributed
in the hope that it will be useful, but without any warranty; without
even the implied warranty of merchantability or fitness for a particular purpose.
License details:
Visit http://www.everaldo.com/crystal/?action=license for details.
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Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
Michele Calgaro
Chris
gregory guy
Timothy Pearson
Darrell Anderson
samelian
toma