It is fairly common to place the multiplier (R, K, M or G) in the place of the decimal point. It helps on bad photocopies/scans of schematics.
R = ohms
K = Kilo ohms
M = Meg ohms
G = Giga ohms
I was still referring to STANDARD EIA values. Manual pots, digital pots, custom-manufactured resistors and trimmable resistors aren't in that category, ergo, 6K is not a standard value. The comment was more for a bit of information for the guy.
Those resistors are SMT-devices which are not similar to any potentiometer or digital pot. They have two connections like any standard transistor and they have standard start values which can be trimmed in circuit within a certain range. The brand of the resistors is "SUSUMU".