6D, 6d, or 6-D may refer to:

  • Canon EOS 6D, a digital SLR camera
  • Jamaica 6d abolition of slavery postage stamp, a 1921 stamp issue
  • Six-dimensional space, any space that has six dimensions
  • 6D skull, a cyberknife tracking method

https://en.wikipedia.org/wiki/6D

"As a professor of science, I assure you we did, in fact, evolve from filthy monkey-men."
Professor Farnsworth
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