What does "fcs" stand for in swift-book repo tags?

Swift Website
1

The swift-book repository uses the suffix "-fcs" in its tags, e.g. "swift-6.2-fcs".

Question: What does "fcs" stand for?

I know it means something like "this is the published final release for this version" and I found some possible meanings (see below) through web search, but no authoritative answer.

Candidates I found:

  • final candidate for shipment
  • final candidate status
  • final customer shipment
2

I would assume it's "first customer shipment", e.g. "this is the release we're shipping to customers as part of the proper release"

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3

Correct. Previous Apple releases used the term "GM" for "Golden Master", but we've since migrated away using the word "master" (see also the "master" branch has been "main" for some time now).

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4

Thank you @grynspan and @harlanhaskins!