city of Jerusalem's geography: the Valley of Ben Hinnom, Tyropoeon Valley, and Kidron Valley, and that these valleys converge to also form the shape of the letter shin, and that the Temple in Jerusalem is located where the dagesh (horizontal line) is. This is seen as a fulfillment of passages such as that instructs Jews to celebrate the Pasach at "the place the LORD will choose as a dwelling for his Name" (NIV). In the Sefer Yetzirah the letter Shin is King over Fire, Formed Heaven in the Universe, Hot in the Year, and the Head in the Soul. The 13th-century Kabbalistic text Sefer HaTemunah, holds that a single letter of unknown pronunciation, held by some to be the four-pronged shin on one side of the teffilin box, is missing from the current alphabet. The world's flaws, the book teaches, are related to the absence of this letter, the eventual revelation of which will repair the universe. In Russian The corresponding letter for the sound in Russian is nearly identical in shape to the Hebrew shin. Given that the Cyrillic script includes borrowed letters from a variety of different alphabets such as Greek and Latin, it is often suggested that the letter sha is directly borrowed from the Hebrew letter shin (other hypothesized sources include Coptic and Samaritan). Sayings with Shin The Shin-Bet was an old acronym for the Israeli Department of Internal General Security, and name of the service is still usually translated as such in English. In Israeli Hebrew and Palestinian Arabic, the security service is known as the “Shabak ”. A Shin-Shin Clash is Israeli military parlance for a battle between two tank divisions ("armour" in Hebrew is שִׁרְיוֹן - shiryon). Sh'at haShin (the Shin hour) is the last possible moment for any action, usually military. Corresponds to the English expression the eleventh hour. Arabic šīn/sīn In the Arabic alphabet, is at the original (21st) position in Abjadi order. represents , and is the 13th letter of the modern alphabet order and is written thus: A letter variant takes the place of Samekh at 15th position. The Arabic letter šīn was an acronym for "something" ( šayʾ(un) ) meaning the unknown in algebraic equations. In the transcription into Spanish, the Greek letter chi (χ) was used which was later transcribed into Latin x. According to some sources, this is the origin of x used for the unknown