duad (noun)

1. In Greek mythology, the duad of Castor and Pollux are known as the Gemini twins.

2. In the anime series, the duad of Naruto and Sasuke form a strong bond as friends and rivals.

3. The duad of Romeo and Juliet is considered one of the most iconic tragic love stories in literature.

4. The artist created a beautiful painting depicting a duad of horses running through a field.