I am writing about Unix file permissions - i.e. user/group/world, read(4)/write(2)/execute(1),
chmod(), etc. I would like to point the reader to a standard (e.g. Markdown have the CommonMark standard, country codes have the ISO 3166-1 standard). But everywhere I've read simply refers to it as "traditional Unix file system permissions".
What is the standard for file permissions in Unix?
This question is similar but more specific to What is responsible for file permissions in a linux system?, which is a bit muddled?