2J1

2j1, also written as 2J1, is an alphanumeric identifier employed in several unrelated domains, most notably in transportation, aerospace, and technology. Its usage varies by industry, and the designation carries no single, universally recognized meaning.

In aviation, 2J1 was formerly the IATA airline code assigned to Sling Airlines, a low‑cost carrier based in Thailand that operated domestic and regional flights before ceasing operations in the early 2020s. The code appeared on tickets, flight schedules, and baggage tags during the airline’s period of activity.

In the context of Japanese railway systems, 2J1 is a station numbering code used on the Keio Line. The code designates Shinjuku‑Koenmae Station, the first station on the line’s secondary branch, facilitating navigation for commuters and tourists by providing a simple alphanumeric reference alongside station names.

Within the aerospace sector, 2J1 refers to a specific variant of the H‑2 rocket family developed by JAXA (Japan Aerospace Exploration Agency). The 2J1 configuration incorporated upgraded avionics and a more efficient upper‑stage engine, contributing to several successful satellite launch missions in the 1990s.

The designation also appears in technology, where 2J1 is a model number for a series of industrial-grade lithium‑ion battery packs produced by a Chinese manufacturer. These packs are rated for high discharge currents and are commonly used in electric vehicles and energy‑storage installations.

Overall, 2j1 serves as a versatile label applied across multiple fields, each instance reflecting the conventions and numbering systems particular to its industry.