Shouldn't this be called Sai (or, two sai)? -- Sixorish 19:33, December 31, 2009 (UTC)
Uhm no, that would be wrong?
You see sais (Atk:45, Def:27). It can only be wielded properly by knights of level 50 or higher. It weighs 50.00 oz.
Cykotitan 21:24, December 31, 2009 (UTC)
It's instinctual for me to use it as plural sai primarily because of its pronunciation (although you could find hundreds of exceptions). A Google search reveals there are an array of spellings, including saya (although I suspect this was mistaken for another word's transliteration). Both WP and their dictionary sister project list the plural as sai, but I cannot find it in any of the more authoritative sources.
Edit: The WP talk page offers an explanation of sorts. Since the word has derived directly from Japanese it seems there are no plurals (although not classified as a singulare tantum because it is countable). -- Sixorish 02:24, January 1, 2010 (UTC)
It was finally addressed with today's patch.