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A large division of time can be called an era, epoch, or eon.
In geology, an era is a greater unit than an epoch. Elsewhere the two words are synonymous.
An era is just a general period of time marked by distinctive events. A decade is 10 years long.
The Roman numeral system was derived from the Etruscan numeral system and they wrote out 1000 and 500 as (I) and I) respectively and over time during the Roman era these symbols evolved into M and D.
I could be wrong, but I believe its an old, old wooden ship that was used during the Civil War era.