[1] メタ構文変数 - Wikipedia (10/23/2011, 6:55:42 AM 版) http://ja.wikipedia.org/wiki/%E3%83%A1%E3%82%BF%E6%A7%8B%E6%96%87%E5%A4%89%E6%95%B0
[3] RFC 3092 - Etymology of "Foo", 1/22/2025, 3:29:17 AM https://datatracker.ietf.org/doc/html/rfc3092
Google search: RFC 3092