I think that DataFrame is now mature enough to have its own logo :)

Check out the logos of:

• PolyMath: https://github.com/PolyMathOrg/PolyMath
• Cormas: https://github.com/cormas/cormas
• Pandas: https://pandas.pydata.org/
• Multiple projects under the NumFocus umbrella: https://numfocus.org/sponsored-projects