Definition: 30H is Hebrew for "The Nine Hundred," a term referring to the Jewish concept of halachic obligation, often associated with the ninth month in the Hebrew calendar, or Leviticus 25:17-26:9. The word '30H' implies that one must fulfill specific responsibilities or obligations during this time period. For instance, one is obligated to observe a certain ritual or perform a certain action on the ninth day of the month. This act could be a holy fast, reciting prayers, fasting from food or drink for seven days, or other such practices.