what does the abbreviation.kl and.p mean

[Balsbyhills]

Working on making a questionnaire and one section in the material deals with walls and their constructions where I can't find the answer to two questions anywhere. One question reads what does the abbreviation .p mean and the other question reads what does .kl mean. Grateful for answers so I can move on.

 

[ppalm]

if the insulation in the wall is concerned, it might be the following Lambda values they mean.
KL = theoretical insulation value
P = practical insulation value with deductions for moisture (-W)

//P