What metric prefix is used for 1 x 10^12?

The metric prefix used for 1 x 10^12 is "Tera." This prefix denotes a factor of one trillion, which is essential in various fields, including electronics and data measurement, where large quantities are frequently encountered. Understanding metric prefixes is critical when discussing data storage, processing speed, and other electronic specifications.

For reference, the prefixes for the other choices are as follows: "Kilo" corresponds to 1 x 10^3, "Mega" refers to 1 x 10^6, and "Giga" represents 1 x 10^9. Each of these prefixes describes increasing orders of magnitude, but Tera stands out as the prefix for the trillion scale, making it the correct choice in this instance.