FYI 2600 and 2.6k use the same number of characters.
Could use the electronics convention and save a character: 2k6
It doesn't mean the same though, 2.6k implies somewhere between 2550 and 2650 years ago and 2600 an exact number of years.
loading story #42762994
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Has the advantage that you can't confuse it with 2600BCE.