What is the abbreviation for megahertz?

In the metric system (SI), capitalization matters greatly. The prefix "mega" stands for one million and is abbreviated with a capital "M". A lowercase "m" stands for "milli" (one-thousandth), which would drastically change the meaning to milli-Hertz. The unit "hertz" is named after the physicist Heinrich Hertz. By convention, units named after a person have their symbol capitalized, so "Hertz" is abbreviated as "Hz". Therefore, the correct abbreviation for megahertz is "MHz", combining the capital "M" for mega and "Hz" for hertz. Options like "Mhz" and "mHZ" violate these standardized capitalization rules.