Well most likely they made it up, however it could work like this

year.month(or vice versa)

Apple could be a generation or other set of years , say working along the lines of "year of the monkey" in the Chinese Zodiac only longer term, or work similarly to the naming of hurricanes

K could be a millennia or longer

So 5.5/apple/k could mean the 5th month in the 5th year in the 1st period (generation, century, whatever) of the 11th millennia (million years, whatever)

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