Final answer:
Cuneiform writing, characterized by wedge-shaped letters, was used by the ancient Akkadians and developed in Sumer. This script was highly flexible, used for many languages, and is one of the earliest forms of writing.
Step-by-step explanation:
The type of alphabet employing wedge-shaped letters used by the ancient Akkadians is known as cuneiform writing. Cuneiform, from the Latin cuneus (meaning "wedge") and formed into the shape of a wedge by pressing a stylus into wet clay, was developed in ancient Sumer. It is one of the earliest known systems of writing and was initially created to record the Sumerian language. However, it soon spread and was adapted by other cultures such as the Akkadians, becoming a highly flexible writing system capable of symbolizing a variety of sounds. The cuneiform script remained in use for thousands of years, serving as a writing system for many other languages in the region, including Babylonian, Assyrian, and several others.