aN2

An2 is a term that can refer to several different things depending on the context, and there is no single canonical meaning. In aviation, An-2 (often written with a hyphen and capital letters) refers to the Antonov An-2, a Soviet-era single-engine biplane designed for rugged field operation. First flown in 1947, it has been widely used for agricultural work, cargo, liaison, and short-field transport. The aircraft is noted for its sturdy construction, high payload for its size, and ability to operate from improvised airstrips. Production and civil use continued in various iterations for many decades, with thousands built in total.

In electronics and embedded systems, AN2 is commonly used as a designation for an analog input channel. Documentation for microcontrollers, data acquisition systems, and laboratory equipment may refer to channels as AN0, AN1, AN2, and so on. In this context, AN2 typically denotes the second analog input, though the exact wiring, signal range, and pin assignment depend on the hardware family and manufacturer.

Because "an2" is not tied to a single standard meaning, it can also appear as an internal code, model number, or variable name in software, datasets, or product documentation. The capitalization, hyphenation, and domain determine which meaning applies. When encountering the term, check the surrounding context or consult domain-specific references to determine whether it refers to the aircraft, an analog input channel, or another usage.