• Using sign language
  Sign language
  A sign language is a language which, instead of acoustically conveyed sound patterns, uses visually transmitted sign patterns to convey meaning—simultaneously combining hand shapes, orientation and movement of the hands, arms or body, and facial expressions to fluidly express a speaker's...
  
  
• Signature
  Signature
  A signature is a handwritten depiction of someone's name, nickname, or even a simple "X" that a person writes on documents as a proof of identity and intent. The writer of a signature is a signatory. Similar to a handwritten signature, a signature work describes the work as readily identifying...
  
  , placing one's name on a document
• Signature (mathematics)
• Manual communication
  Manual communication
  Manual communication systems use articulation of the hands to mediate a message between persons. Being expressed manually, they are received visually, and sometimes tactually...
  
  , signing as a form of communication using the hands in place of the voice
• Digital signature
  Digital signature
  A digital signature or digital signature scheme is a mathematical scheme for demonstrating the authenticity of a digital message or document. A valid digital signature gives a recipient reason to believe that the message was created by a known sender, and that it was not altered in transit...
  
  , signing as a method of authenticating digital information

See also

• Sign (disambiguation)
• Wikipedia:Sign your posts on talk pages, the Wikipedia policy of signing Talk pages