tlc

As an abbreviation tl

is tsp (teaspoon as a unit of measure).

As an initialism tlc is

tender loving care.

In analytical chemistry|lang=en terms the difference between hplc and tlc

is that hplc is (analytical chemistry) high performance liquid chromatography or high pressure liquid chromatography while tlc is (analytical chemistry) thin layer chromatography.

As initialisms the difference between hplc and tlc

is that hplc is (analytical chemistry) high performance liquid chromatography or high pressure liquid chromatography while tlc is tender loving care.

As initialisms the difference between tlc and ttyl

is that tlc is tender loving care while ttyl is talk to you later.

As a noun taxonomy

is the science or the technique used to make a classification.

As an initialism tlc is

tender loving care.