"Ca" stands for "circa", which basically means "on or about". In short it's used to denote a time which can be determined approximately but not precisely.
A beginning
what is the difference between vertical and horizontal timeline
Detailed Timelines contain events for years between 800 and 1499AD However. what makes you think they ever ended?
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In math, it may look like this: ~Wikipedia also states: Circa (often abbreviated c., ca., ca or cca. and sometimes italicized to show it is Latin)
It means Before Present.
CA stands for "Computer Associates".
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CALIFORNIA
California
Ca stands for calcium and C stands for Carbon.
The CA stands for the sponsoring company CA Inc. http://en.wikipedia.org/wiki/CA_Inc.
Calcium.
"Central Amerita".
In chemistry Ca stands for calcium and Mg stands for magnesium.
In India, the CA prefix before a name denotes "Chartered Accountant"
Circa (often abbreviated c., ca., caor cca.