Lamed means a "sting". It also refers to the fact teach, learn, learn. The existence of the lamed implies a goal toward which we should go, but also shows the transition in which we find ourselves before reaching a new state. Lamed means that the study and sting us that the study should be followed by deeds, showing what has been learned is not just a theory without foundation. Three letters of the word are lamed initial lev, Mevin, daat "a heart that understands knowledge". With its central location is the heart of the aleph-beth.
The Lamed is generally thought of a stick, or a shepherd's staff with the curved end, as shepherds use to orient. it is the instrument which the USING shepherd leads his flock and leads.