Foo is described in RFC 3092 along with Bar and FooBar

Approximately 212 RFCs, or about 7% of RFCs issued so far, starting with RFC 269, contain the terms `foo', `bar', or `foobar' used as a metasyntactic variable without any proper explanation or definition. This may seem trivial, but a number of newcomers, especially if English is not their native language, have had problems in understanding the origin of those terms. RFC 3092 rectifies that deficiency.

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