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  2. Problem set - Wikipedia

    en.wikipedia.org/wiki/Problem_set

    A problem set, sometimes shortened as pset, [1] is a teaching tool used by many universities. Most courses in physics, math, engineering, chemistry, and computer science will give problem sets on a regular basis. [2] They can also appear in other subjects, such as economics.

  3. Crossword abbreviations - Wikipedia

    en.wikipedia.org/wiki/Crossword_abbreviations

    Setter – I, ME, ONE (meaning the setter of the crossword) Setter's – MY (meaning the setter of the crossword) Sex appeal – IT (after Clara Bow – the It girl) or SA; Shilling – S; Ship – SS (steam ship) Ship's officer – PO (petty officer) Shirt – T; Short wave – SW; Side – LEG, OFF, ON; Significant other – SO

  4. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    Like other lunisolar calendars, the Hebrew calendar consists of months of 29 or 30 days which begin and end at approximately the time of the new moon. As 12 such months comprise a total of just 354 days, an extra lunar month is added every 2 or 3 years so that the long-term average year length closely approximates the actual length of the solar ...

  5. The New York Times crossword - Wikipedia

    en.wikipedia.org/wiki/The_New_York_Times_crossword

    When an extended phrase of the answer can also be used in the clue to mutual meaning, the mutual extension is indicated in parentheses. e.g., [Think (over)] for MULL, [Drive (away)] for PUSH. When the answer can use an additional word to fit the clue, the word is preceded by "with" and placed in quotes. e.g., [Understand, with "in"] for SINK.

  6. Cryptic crossword - Wikipedia

    en.wikipedia.org/wiki/Cryptic_crossword

    A 15x15 lattice-style grid is common for cryptic crosswords. A cryptic crossword is a crossword puzzle in which each clue is a word puzzle. Cryptic crosswords are particularly popular in the United Kingdom, where they originated, [1] as well as Ireland, the Netherlands, and in several Commonwealth nations, including Australia, Canada, India, Kenya, Malta, New Zealand, and South Africa.

  7. Pinball Number Count - Wikipedia

    en.wikipedia.org/wiki/Pinball_Number_Count

    Pinball Number Count (or Pinball Countdown) is a collective title referring to 11 one-minute animated segments on the children's television series Sesame Street that teach children to count to 12 by following the journey of a pinball through a fanciful pinball machine.

  8. Counting of the Omer - Wikipedia

    en.wikipedia.org/wiki/Counting_of_the_Omer

    The count has its origins in the biblical command of the Omer offering (or sheaf-offering), which was offered on Passover, and after which 49 days were counted, and the Shavuot holiday was observed. The Temple sacrifices have not been offered since the destruction of the Temple in Jerusalem , but the counting until Shavuot is still performed.

  9. Countable set - Wikipedia

    en.wikipedia.org/wiki/Countable_set

    In mathematics, a set is countable if either it is finite or it can be made in one to one correspondence with the set of natural numbers. [a] Equivalently, a set is countable if there exists an injective function from it into the natural numbers; this means that each element in the set may be associated to a unique natural number, or that the elements of the set can be counted one at a time ...