TK-421 is a term that has different meanings depending on the context. Here are the different meanings of TK-421 based on the search results:

• Star Wars character: TK-421 was the designation of a human male Imperial stormtrooper who served on Lasan before he was stationed on the Death Star battle station. In the Star Wars Legends continuity, TK-421 was the designation of a clone stormtrooper stationed aboard the first Death Star.

• Music: Lenny Kravitz released a song called "TK421" as the lead single of his album "Blue Electric Light" in 2023.

• Trivia: TK-421 is the only stormtrooper in the Star Wars series who actually got his name mentioned.