The logo for the R for Mass Spectrometry organization is distributed under the CC-BY-SA 4.0 license. It includes the R logo from The R Foundation which is under the CC-BY-SA 4.0 license. The R-logo was modified to represent the schematics of a simple mass spectrometer (the mass analyzer) and showcases 3 ions being separated by their mass-to-charge ratio.
The source of the logo is available in xcf format and can be opened and edited with gimp.