G'day Euclidessn,
The letter 'K' is the standard metric abbreviation for one thousand, I'm sure you already know this. 1 kilogram being 1000 grams, 100 kilograms being 100,000 grams etc.
The abreviation you mentioned
is a little incorrect in that it doesn't state the unit of measurement but in the aviation industry it is accepted to mean a 27,000lbs thrust engine.
Regards,
BH.
(B767 driver with 60k engines
)