What term describes several tornadoes produced by the same storm cell?

Several tornadoes produced by the same storm cell are called a tornado family.

A family can form when a supercell produces tornadoes one after another as its rotating updraft cycles, or when satellite tornadoes develop around a dominant circulation. Their tracks may appear as a line of separate paths, overlapping paths, or one nearly continuous damage corridor.

Historical records sometimes misidentified a tornado family as one exceptionally long-lived tornado. The 1925 Tri-State Tornado, for example, was long debated as either one tornado or a family, while later analyses identified some other famous long-track events as families. The term is not the same as a tornado outbreak: an outbreak involves multiple tornadoes across a broader storm environment, often involving several storms.