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P11, P-11 or P.11 may refer to:

In government and politics[edit]

  • P11D, a tax form used in the United Kingdom

In military[edit]

  • Heckler & Koch P11, a special purpose Heckler & Koch pistol designed to be used underwater
  • Heckler & Koch HK4, a pistol produced by Heckler & Koch, which was used by the German military as the "P11"
  • Kel-Tec P-11, a semi-automatic pistol designed for concealed carry
  • Piaggio P.11, a variant of British 1928 Blackburn Lincock fighter aircraft
  • PZL P.11, a fighter aircraft used by the Polish Air Force during the invasion by Germany in 1939

In science and academia[edit]

  • Pioneer 11, a satellite launched to explore Jupiter and the outer solar system
  • p11 protein, a protein found in the brain of humans and other mammals
  • Pseudomonas sRNA P11, a gene of the pathogen Pseudomonas aeruginosa

In arts and culture[edit]

  • Painters Eleven, sometimes written as P11 or Painters 11, a group of abstract painters active in Canada in the 1950s

In Cryptography[edit]

  • PKCS #11, a platform independent API to access cryptographic tokens such as smart cards and HSM's

See also[edit]