13 is a prime number, twin prime with 11, and cousin prime with 17. Atomic number of aluminum is 13. A 13-sided regular polygon is called a tridecagon
Fortuna was the Roman goddess of fortune and luck, equivalent to Greek Tyche. Her name possibly derived from "Vortumna" meaning "she who revolves the year". First temple dedicated to Fortuna was built by Etruscan Servius Tullius. Temple dedication occurred on June 24, Midsummer's Day
Red envelopes symbolize energy, happiness, and good luck in Chinese culture. Tradition originates from story of child using coins wrapped in red paper. Red envelopes are called "ya sui qian" meaning "suppressing Sui money"
May indicates strong likelihood, might hints at lower likelihood. In casual speech, may and might can be used interchangeably. May and might are modal auxiliary verbs for possibility and permission
Luck penny originated in Ireland as a small money returned for farm animal purchases. Traditionally, sellers spat on the penny to bring luck. Modern tradition extends to wishing well for friends and family. Lucky Irish Penny featured harp and agricultural symbols designed by Yeats
Four-leaf clovers are ancient Irish symbols believed to bring luck and protection. Horseshoes have been associated with luck since ancient times. Lucky dice were popular during WWII for pilot missions. Ladybugs bring luck in various cultures, especially deep red ones