0-based, half-open coordinate system or interbase coordinate system

| A | C | G | T | A | C | G | T |
0 | 1 | 2 | 3 |  4 | 5 |  6 | 7  | 8

So if you wanted to describe the first base, it would be:

chr 0 1

and GTAC:

chr 2 6

http://biostar.stackexchange.com/questions/7064/bed-coordinates

Update:
Interbase coordinates (top) and base-oriented (below) from Chado Wiki

0 based half open coordinate system or interbase…
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