2,000 English idioms, phrases and expressions that we use daily, with their meanings and origins explained...
1 An abbreviation might be formed using the first and last letter of the complete word.  2 Yard, for example, is abbreviated yd., and quart is abbreviated qt.. 3  Some measurement abbreviations are formed by using the first letter or two (or sometimes three) of the word. 4  Some examples of this are mi. ( 5 mile), in.
Fathom is an imperial, US customary length unit and usually used to measure the depth of water. The abbreviation is ftm. Meter is a metric system base length unit and defined as the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. It equals to 3.2808399 feet or 39.3700787 inches. The abbreviation is m. For other length unit conversions, please go to Length Conversion.