Wikipedia:Articles for deletion/T-code
The topic easily passes  because entire books are written about it: https://books.google.co.uk/books?id=FtGrDgAAQBAJ; https://books.google.co.uk/books?id=55zCbwAACAAJ; https://books.google.co.uk/books?id=MePjHgAACAAJ
— user:Andrew, 17:29, 30 June 2020 (UTC)
Stance: keep
Cited policy: WP:GNG (Wikipedia:Notability)