What are "Friction velocity uet" and "Friction velocity uk"?

Hello,
I just want to know What are “Friction velocity uet” and “Friction velocity uk”?

In the uesr guide, I found “uk” related to kinematic energy, but I could not find “uet”.

Would someone tell me this?

Best regards,
Tsubasa

Hello,

uet is sometimes used for ustar (from code which was previously im French, where “ètoile” means “star”).

Best regards,

Yvan