Argus Filch refers to it as "triwizard key" when he finds Harry's egg on the stairs. Only owning the German audio book, I can´t look up if it is capitalised. Should Triwizard key be considered an official name for it?--Rodolphus (talk) 14:31, May 12, 2016 (UTC)

From US GOF Ch 25 "This is a Triwizard clue!" He says it the same again when accusing Peeves so no caps. Triwizard is always capitalized but only Triwizard Tournament and Triwizard Cup are, not Triwizard champion, judge, event, or winnings. The ebooks are really useful for these sort of checks! --Ironyak1 (talk) 15:32, May 12, 2016 (UTC)