Definition of "PET"

PET

noun
countable and uncountable, plural PETs
1. (uncountable, organic chemistry) Initialism of polyethylene terephthalate.
2. (countable, medicine) Acronym of positron emission tomography.
3. (countable, genetics) Acronym of paired-end tag.
4. (countable, historical, computing, backronym) Acronym of personal electronic transactor, a line of personal computers produced by Commodore International.
  Quotations
  Why is the order of graphical characters in the PETSCII table so seemingly haphazard? The answer is that arrangement was dictated by the PET keyboard design, a hardware-driven decision.
  2014, Nick Montfort et al., 10 PRINT CHR$(205.5+RND(1)); : GOTO 10, MIT Press, page 225
proper noun
1. (Canadian politics) Initialism of Pierre Elliott Trudeau.
  Quotations
  But Wright takes a rather contrarian position about the impact of emotionally charged Trudeaumania on PET’s astonishing political rise in 1968.
  2016 November 20, “New books put Trudeaumania in fresh perspective”, in Toronto Star‎, archived from the original on 2017-08-07