In Sikhism, the number 13 is considered a special number since 13 is tera in Punjabi, which also means "yours" (as in, "I am yours, O Lord"). The legend goes that when Guru Nanak Dev was taking stock of items as part of his employment with a village merchant, he counted from 1 to 13 (in Punjabi) as one does normally; and thereafter he would just repeat "tera", since all items were God's creation. The merchant confronted Guru Nanak about this, but found everything to be in order after the inventory was checked. April 13 also usually turns out to be Vaisakhi every year, which is the Sikh New Year and the major Sikh Holiday.
* In Judaism, 13 signifies the age at which a boy matures and becomes a Bar Mitzvah (Age of 12 for Girls, or Bat Mitzvah).
* The number of principles of Jewish faith according to Maimonides
* According to the Torah, God has 13 Attributes of Mercy
* The number of circles, or "nodes", that make up Metatron's Cube in Kaballistic teachings.
* In Mesoamerican divination, 13 is the number of important cycles of fortune/misfortune (see Trecena).
* The number of Norse gods (there were 12) at a banquet that was crashed by the evil spirit Loki (making 13) who killed Baldr with an arrow/spear made out of mistletoe using Hodr, thus marking the beginning of Ragnarok.
* Halloween's date is 13 reversed.
Several successful sports figures have worn the number 13. Ozzie Guillén, manager of the 2005 World Series Champion Chicago White Sox, has worn the number throughout his baseball career. Alex Rodriguez began wearing it upon joining the New York Yankees (three, the number he had previously worn, is retired by the Bronx Bombers to honor Babe Ruth). Dan Marino, an American football player known for passing the 2nd most yards in NFL history, wore the number 13, although pundits in the sport have often cited him as the greatest quarterback never to win an NFL championship. Basketball great Wilt Chamberlain wore the number 13 on his jersey throughout his NBA career. Also, FIBA rules require a player to wear the number in international competitions (only numbers from 4 to 15 could be worn, and as there are 12 players, one must wear 13); Chris Mullin, who wore #20 in college and #17 in the NBA, wore #13 for both (1984 and 1992) of his Olympic appearances. Shaquille O'Neal wore #13 in 1996, Tim Duncan wore #13 in 2004, Steve Nash is currently wearing it for the Phoenix Suns, Yao Ming wore it in the 2008 Olympics in Beijing, and Mats Sundin, wears 13 in the NHL. One of Iceland's all time best handball players, Sigurður Sveinsson, wore the number 13 when he played for the national team.
In Italy, 13 is also considered to be a lucky number.
Colgate University also considers 13 to be a lucky number. They were founded in 1819 by 13 men with 13 dollars, 13 prayers, and 13 articles. (To this day, members of the Colgate community consider the number 13 a good omen.) In fact, the campus address is 13 Oak Drive in Hamilton, NY and the all men a cappella group is called the Colgate 13.
In tattoo culture, where symbols often represent the opposite of their most obvious meaning, 13 sometimes symbolizes good luck, especially in "old school" (meaning traditional) style tattoos.
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Thirteen was once associated with the Epiphany by Christians, as it is said the child Jesus received the Magi on his thirteenth day of life.