What is the meaning of L-?

deprecated notation for levorotatory (versus modern notation, (−)).

The l-classifier, one of four classifiers which obligatorily appear in every Ahtna verb with a variety of purposes. The l-classifier has the following uses:

1. Forms the passive of (mostly transitive) verbs with the ł-classifier
2. Forms many intransitive verbs
3. Forms iterative verbs via classifier shift from the ł-classifier
4. Forms reciprocal verbs
5. Forms benefactive verbs
6. Forms reflexive verbs
7. Forms mediopassive verbs
8. Forms neuter (adjectival) verbs from nouns
9. Forms transitive verbs with incorporated objects
10. Appears in many imitative and onomatopoeic verbs
11. Appears in many verbs with no clear function

Forms the passive of (mostly transitive) verbs with the ł-classifier

Forms many intransitive verbs

Forms iterative verbs via classifier shift from the ł-classifier

Forms reciprocal verbs

Forms benefactive verbs

Forms reflexive verbs

Forms mediopassive verbs

Forms neuter (adjectival) verbs from nouns

Forms transitive verbs with incorporated objects

Appears in many imitative and onomatopoeic verbs

Appears in many verbs with no clear function

The l-classifier, one of several classifiers which obligatorily appear in every Wailaki verb, used primary to passivize transitive verbs formed with the ł-classifier.

alternative form of il-

the l- classifier or valence-change prefix, a detransitivizing prefix of active verbs that modifies the transitivity or valence and grammatical voice of a verb, and occurs in most passive, mediopassive, reflexive, and reciprocal verbs that are derived from verbs with a ł- classifier

Source: wiktionary.org