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The description on its file description page there is shown below.
Summary
DescriptionContributor Attribute Rubric.png
English: This rubric gives the product team a way to prioritize the needs of an Editor by attribute type. Here we compare their experience-level as a Wikipedia editor against their experience-level as a mobile device user.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.