400, or one count [of four hundred]; often, this number of grasses in a bundle (sprigs of herbs) (see Karttunen and Molina); lots, or an innumerable amount (Lockhart)
James Lockhart Nahuatl as Written: Lessons in Older Written Nahuatl, with Copious Examples and Texts (Stanford: Stanford University Press and UCLA Latin American Studies, 2001), 214.