What is the meaning of ל?

Lamed: the twelfth letter of the Hebrew alphabet, after כ and before מ.

The numeral 30 in Hebrew numbering.

The third letter of a verb root; so called because it's the third letter of the word פעל.

Initialism of לוֹעֲזִי (foreign), used to indicate that a term originates from a foreign language rather than from the four layers of Hebrew: loanword

Source: wiktionary.org