On the first Unix system I used, 40 years ago, you had to had at least 3 characters (letters). I used consonants from my last name, as I had used in arcade game

On the first Unix system I used, 40 years ago, you had to had at least 3 characters (letters). I used consonants from my last name, as I had used in arcade games before. And I've been using the same trigram ever since.