kappa (noun)

1. In the anime series, the character wore a shirt with the symbol of the Greek letter kappa.

2. During their romantic getaway, they watched the sunset while tracing the Greek letter kappa in the sand.

3. Archaeologists discovered ancient Greek pottery inscribed with the letter kappa, which provided valuable insight into the civilization's writing system.

4. In the movie, an important clue was hidden in a coded message that involved the use of the Greek letter kappa.