What is the meaning of лъ?

The twenty-eighth letter of the Adyghe alphabet, written in the Cyrillic script.

The forty-fourth letter of the Archi alphabet, written in the Cyrillic script.

The twenty-eighth letter of the Kabardian alphabet, written in the Cyrillic script.

The twentieth letter of the Avar alphabet, written in the Cyrillic script.

Source: wiktionary.org