2J

2j is a term used in multiple contexts, with the most notable meanings centered in automotive engineering and mathematics. In automotive discussions, 2j is commonly associated with Toyota's JZ engine family, particularly the 2JZ line used in performance cars. The best-known member is the 2JZ-GTE, a turbocharged inline-six introduced in the 1990s for the Toyota Supra, and the naturally aspirated 2JZ-GE used in other models such as the Lexus IS300. The 2JZ family is regarded for its robust construction, adaptability to high power outputs, and extensive aftermarket support, making it a staple in motorsports and street performance.

In mathematics and electrical engineering, 2j denotes two times the imaginary unit j, where j^2 = -1. It is used in complex arithmetic and phasor representations. For example, a complex number might be written as 3 + 4j, and engineers commonly use j instead of i to avoid confusion with current denoted by I.

Outside these fields, 2j can also appear as a model number, product code, or shorthand in various catalogs and branding. In such cases, its meaning is highly context-dependent and does not have a single standard interpretation.