a9

A9 is a designation used for several unrelated things, including roads and a mobile processor. The exact meaning depends on the context.

In transportation, A9 denotes major highways in various countries. The most prominent is Germany's Autobahn A9, a north–south expressway that connects Berlin in the north with Munich in the south. Other countries also use the A9 label for significant roads, though the specific routes differ by nation.

In technology, A9 refers to Apple's A9 system-on-a-chip, introduced in 2015 and used in devices such as the iPhone 6s, the iPhone 6s Plus, and the first-generation iPhone SE. It is a 64-bit ARM-based processor co-developed by Apple and manufactured by TSMC and Samsung, produced on advanced semiconductor processes. The A9 includes two high-performance CPU cores (codenamed Twister) and a PowerVR GT7600-based graphics unit, with the M9 motion coprocessor integrated to handle sensor and motion data.

Other uses of the A9 designation occur in local transport networks or product model numbers in other industries; as a general label, it is not unique to any single domain. When encountering the term, context is typically required to determine whether it refers to a road designation, a microprocessor, or another use.