The Book of Judges tells of how the Ephraimites were killed because they could not pronounce a sound made       by this letter in the word "shibboleth."
A cipher in which the letter beth ["bait"] is replaced with this letter is used several times in the Book of Jeremiah to disguise the name of Babylon. The contours of the land on which Jerusalem was built are said to form the shape of this letter. Mezuzah cases are often marked with this letter, which represents the number 300 in gematria. Though Israeli dreidels use the letter pe instead, this letter joins nun, gimel, and (*) he on most dreidels. The gesture made during the Priestly Blessing, which is the basis for the Vulcan salute, imitates the shape of this letter. The Book of Judges tells of how the Ephraimites were killed because they could not pronounce a sound made       by this letter in the word "shibboleth." For 10 points, name this Hebrew letter which represents the sounds "s" and "sh."
A cipher in which the letter beth ["bait"] is replaced with this letter is used several times in the Book of Jeremiah to disguise the name of Babylon.
shin