"What does v2 mean...?" I haven't found a definitive answer to that question. Speculation: Version? Vendetta? Vector? Velocity? Takeoff safety speed (V2)?  References to "v2" that I've found in QMAP:  790 - https://qmap.pub/read/790 799 - https://qmap.pub/read/799 953 - https://qmap.pub/read/953 2496 - https://qmap.pub/read/2496 2941 - https://qmap.pub/read/2941 3584 - https://qmap.pub/read/3584 4595 - https://qmap.pub/read/4595 4600 - https://qmap.pub/read/4600 4601 - https://qmap.pub/read/4601