Snoopy cap

From Snoopy +‎ cap, from the comic strip Peanuts having an association with NASA and the cap wrapping around an astronaut’s head like a dog’s ears.

Snoopy cap (plural Snoopy caps)

1. A piece of headgear worn by astronauts with built-in communications technology.
   • 1997 February 5, R. Mike Mullane, Do Your Ears Pop in Space? and 500 Other Surprising Questions about Space Travel, Wiley, →ISBN, page 52:

     Of course, the helmet and Snoopy cap headphone arrangement insulate astronauts from some of the noise.

   • 2015 July 17, Dale Anderson, Ian Graham, Brian Williams, “Astronaut”, in Flight and Motion: The History and Science of Flying, Taylor & Francis, →ISBN, page 109:

     An astronaut wears a close-fitting cap, called a Snoopy cap, which contains a radio for communications.

   • 2018 September, Ian Graham, “Launch Day”, in You Wouldn't Want to Be on Apollo XIII!, Book House, →ISBN, page 10:

     SNOOPY CAP. This soft cap (4) contains earpieces and a microphone for radio communications.

   • [2020 October 6, John Rocco, “5: Staying Alive in Space”, in How We Got to the Moon: The People, Technology, and Daring Feats of Science Behind Humanity's Greatest Adventure, Random House Children's Books, →ISBN, page 150:

     Also known as the Snoopy cap, nicknamed after the Peanuts character whose ears it resembles,* the communications carrier assembly has two earphones and two microphones.

     Note in the original: “Snoopy is the official mascot of the Apollo space program.”]