the Ox (second sign of the Chinese zodiac); hour of the Ox (around 2am, 1-3am, or 2-4am); north-northeast; twelfth month of the lunar calendar
dead of night; middle of the night; midnight; third quarter of the hour of the ox (2-2:30am, or 3-3:30am)
cursing ritual where one visits a shrine at 2am and nails a doll representing a person to a tree, praying for said person's death