12n1

12N1 is a alphanumeric designation that appears in several unrelated contexts, most notably in transportation, engineering, and technology. In the United Kingdom, 12N1 is the code for a specific weekday night bus service operating between the city centre of Manchester and the suburb of Northenden, providing a reduced‑frequency link after regular daytime routes have ceased. The route is scheduled to run hourly from 22:00 to 02:00, and it is part of the broader “N” series of night services that complement the daytime network.

In the field of materials science, 12N1 refers to a stainless‑steel alloy defined by the Russian GOST standard. The alloy contains approximately 12 % nickel, 1 % molybdenum, and a balance of iron, giving it enhanced corrosion resistance and acrylic‑like ductility. It is commonly employed in marine fittings, chemical processing equipment, and cryogenic storage vessels.

The term also appears in electronics as the model number for a compact, single‑band radio transceiver produced by the Japanese manufacturer Kenwood in the early 1990s. The 12N1 unit was designed for amateur radio operators, offering a frequency range of 30–30 MHz, a built‑in antenna tuner, and a 5‑W output. Though superseded by later models, it remains a collector’s item among vintage radio enthusiasts.

Finally, 12N1 is occasionally used in academic literature as a placeholder label for a theoretical construct in combinatorial mathematics, denoting a specific family of graphs with twelve vertices and a single irregular node. In each of these usages, the designation serves as a concise identifier within its respective domain, without implying any direct relationship among the separate fields.