Final answer:
The technique used to describe Uruk as the "strong-walled" in the end of Tablet I of The Epic of Gilgamesh is called an epithet.
Step-by-step explanation:
The technique used to describe Uruk as the "strong-walled" in the end of Tablet I of The Epic of Gilgamesh is called an epithet. An epithet is a descriptive phrase or word that is used to characterize a person, place, or thing. By describing Uruk as "strong-walled", the text emphasizes the city's defensive capabilities and creates a vivid image in the reader's mind.