What does LTK stand for?

Laser Thermal Keratoplasty (SAUS)

Latakia - Syria - Airport symbol (OAG)

Lead To Come - Copyediting (WDMC)

Leukocyte Tyrosine Kinase - An enzyme

L. T. Boat Co., Green Bay, WI - Manufacturer code for watercraft hull identification number (USCG)