שֵׁשׁ shêsh (H8336)

bleached stuff, i.e. white linen or (by analogy) marble

1) something bleached white, byssus, linen, fine linen 2) alabaster, similar stone, marble

or (for alliteration with מֶשִׁי (H4897)) שְׁשִׁי; for שַׁיִשׁ (H7893);