What is the term for winning all four Grand Slam tournaments in a single calendar year?

The term for winning all four Grand Slam tournaments in a single calendar year is called a "Grand Slam." In tennis, a Grand Slam consists of the four major tournaments: the Australian Open, the French Open, Wimbledon, and the US Open. When a player achieves this feat within the same calendar year, they are said to have completed a "Calendar Year Grand Slam." This is a significant achievement in the sport, highlighting the player's dominance and consistency across different surfaces and conditions throughout the year. Only a few players in tennis history, such as Rod Laver and Serena Williams, have accomplished this remarkable goal.