Nowhere. It's just something Mike Wong used to try to lower the number of captail ships in the UFP. Starfleet had 12000 Cap ships just before the start of the Dominion war. This count DOES NOT inculde fighters, shuttles, runabouts, tugs, shuttlepods or anything else. (Like member fleets, priv ships etc)
Hmmm, that's an awful lot of ships. Given 12000 cap ships, and something like 150 member planets, that's roughly 80 cap ships per planet. Most impressive. Now, let us assume for a moment that the Klingons and Romulans (traditional ally/foe) have ships in close parity, that would put them at roughly that many ships as well, right? Cause otherwise, the Feds might have steamrolled those two empires long ago. (peaceful Feds notwithstanding, there is enough canon evidence of aggressive Federation admirals such that if there weren't cap ship parity at some levels, the Rommies and Klinks would've been crushed) So, the first premise is that the national fleets of the Klinks, Feds, and Roms are roughly equal in terms of quality if not quantity.
Ok, now, if I recall, the Dominion were taking on the entire Fed/Klink alliance and were actually winning. Let us say that the Klink/Fed each put in a quarter of their fleet on the various borders, they'd still have something like 12000 ships total (factoring in earlier Klink loses against Cardassians) facing the Dominion at the beginning of the war. So, what you're saying is that the Dominion must have had at least 12000 ships or more in terms of actual quality and spectacular military leadership to be beating up on both the Feds and the Klinks at the same time.
So, going back to the battle where 1200 Dom/Cardi ships went against 600 or so Fed ships. It would be fairly reasonable to assume that the reinforcements coming would deal the deathblow to the Fed/Klink alliance. The reinforcement consisted of 2800 Dominion ships.
Now, the if 2800 extra ships can deal the crushing blow to the Fed/Klink alliance. It can mean one of two things:
1) The losses on both sides were so great, that the pre war numbers of greater than 12,000 has been reduced significantly by more than half. This means that both sides have planets that are just wide open for the taking since where there used to be task forces of 80 ships defending each Fed planet, there are probably less than half that number now. This of course begs the question why the Rommies didn't just jump in at some point and take down either the Feds or the Klinks or even the Dominion since the Roms were generally uninvolved and had a much fresher fleet.
2) The Feds do not have nearly 12000 ships, and thus are able to maintain parity with the Roms even through significant losses on the Dominion front.
That's it for now.[/quote]