In a few special cases, we customarily drop the ending vowel of a prefix when combining with a unit that begins with a vowel: it’s megohm (not “megaohm”); kilohm (not “kiloohm”); and hectare (not “hec...In a few special cases, we customarily drop the ending vowel of a prefix when combining with a unit that begins with a vowel: it’s megohm (not “megaohm”); kilohm (not “kiloohm”); and hectare (not “hectoare”). For example, 24.9 MQ may be written “24M9”. This saves space on electronic diagrams and when print- ing values on electronic components, and also avoids problems with the decimal point being nearly invisible when the print is tiny.
