Signature of American anthropologist and anarchist activist David Graeber.
Scan from Graeber's personal library by his wife, Nika Dubrovsky, provided to the Museum of Care for its 2021 Visual Assembly (link to original PDF on Dropbox; a doodled portion of the original signature has been removed in the process of converting the file to SVG, because unlike a handwritten signature a drawing is copyrightable and presumptively copyrighted by default).
David Graeber