The abbreviation in []

Sean Chen
2010-01-05T01:06:59Z

Hi,

I apologize if this question was answered. I tried to search it but I
am still not sure.

I don't know some abbreviations in the title, like [RFA] (Request for
Approval?), [RFC[ (Request for Comment?), [OB] (Obvious?), etc. Is
there a list about these abbreviations? Thanks in advance.

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Best Regards,
Sean Chen