If, through no fault of your own, I'm sure, you are not familiar with Gundam Wing, here is a brief explanation of the pairing numbers.

Some numbers are associated very clearly with their names. First, our gorgeous OZies are Zechs Merquise, aka Milliard Peacecraft (and variations thereon - we're dealing with transliterations here), represented, not surprisingly, by the number 6, and Treize Khushrenada, represented equally unsurprisingly by the number 13. Together, 6x13x6, depending on who's on top, they are my favorite pairing and, to paraphrase Maynard (because I tragically cannot find the quote), Treize is never more beautiful than when he has his legs over Zechs' shoulders.

My other favored pairing is 13x5, Treize and Chang Wufei, Pilot 05 of Shenlong Gundam represented by the number 5. The other four Gundam pilots are each associated with the number of their Gundam, 1 through 4, thus Heero is represented by the number 1, Duo by 2, Trowa by 3, and Quatre by 4. I understand that their numbers are also incorporated into all their names, although I have to take the non-latinate ones on faith.^_^ In Zeppin you will see 3+5 and 2+5, and in Previews you will see both 5+2 and 3+4.

There are other number names in Gundam Wing, but their owners don't appeal to me.^_~