In a 1943 dime, the "W" does not stand for anything specific; it represents the initials of the designer, Adolph A. Weinman, who created the "Mercury Dime" design featuring the profile of Liberty with a winged cap, which is why people often mistakenly call it a "Mercury" dime. 
Key points about the "W" on a 1943 dime: 
  • Designer: The "W" stands for Adolph A. Weinman, the artist who designed the Mercury Dime. 
  • Misconception: Although called a "Mercury" dime, the design actually depicts Liberty wearing a winged cap symbolizing "liberty of thought". 
  • Where to find the initials: You can find the "W" on the obverse side of the coin, near the date.