What does achieving a Grand Slam mean across different sports?

#4 NASCAR

A typical start in a NASCAR race

The Association for Stock Car Auto Racing (NASCAR) terms a driver as a grand slam winner if he wins all Monster Energy NASCAR Cup Series majors in a calendar year. The series includes the Daytona 500, Winston 500, Coca-Cola 600 and Southern 500. The achievement would be called the 'Small Slam' if the driver wins any three NASCAR Cup Series majors.

The Grand Slam in NASCAR was formally announced in 1984. No driver could win the title until it was scrapped in 1997. From 1998, Career Grand Slam was introduced in which drivers can win the Series Majors in their entire career.