What prefix indicates one billion of a base unit?

The prefix that indicates one billion of a base unit is "Giga." In the International System of Units (SI), "Giga" is derived from the Greek word for giant and represents a factor of (10^9) or 1,000,000,000. This prefix is commonly used in various fields, such as computing (gigabytes) and telecommunications, where large quantities are often described.

In contrast, "Mega" denotes one million ((10^6)), "Kilo" refers to one thousand ((10^3)), and "Hecto" signifies one hundred ((10^2)). Each of these prefixes represents increasingly smaller orders of magnitude when compared to "Giga," which is significant in contexts where very large numbers are commonplace. Understanding these prefixes is essential for interpreting measurements accurately across various scientific and engineering disciplines.