Lowercase `` o '' for `` octet '' is a commonly used symbol in several non-English-speaking countries , and is also used with metric prefixes -LRB- for example , `` ko '' and `` Mo '' -RRB- .

Sometimes it is incorrectly abbreviated as lowercase `` b '' ; lowercase `` b '' is the abbreviation for `` bit '' . For example , `` MB '' means `` Megabyte '' and `` Mb '' means `` Megabit '' .
