It's not used anywhere by people. But it's used by Nature, wherever plants grow.
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Different authors use different conventions for indexing the Fibonacci sequence (n.b., "sequence" not "series"). For example, in Cameron's Combinatorics, he defines F1=1, F2=2. The most common choice, used for example in Sloane's Online Encyclopedia of Integer Sequences (http://www.research.att.com/~njas/sequences/), is to define thezeroth Fibonacci number to be 0 and the first to be 1; thus the second is also 1. With this choice, a number of formulas become simpler and we have this particularly nice number-theoretic result: if m divides n, then the mth Fibonacci number divides the nth Fibonacci number.
The answer depends on the sequence. Different sequences may be used in different circumstances.
Your mind will be blown if you search Phi, The golden ratio, or the fibonacci sequence. It has to do with everything.
E means Electronic in this real world of technology
Money.