What is the double L symbol?
In English, ⟨ll⟩ often represents the same sound as single ⟨l⟩: /l/. The doubling is used to indicate that the preceding vowel is (historically) short, or that the "l" sound is to be extended longer than a single ⟨l⟩ would provide (etymologically, in latinisms coming from a gemination).
What is an L with a slash through it?
Ł or ł, described in English as L with stroke, is a letter of the Polish, Kashubian, Sorbian, Belarusian Latin, Ukrainian Latin, Wymysorys, Navajo, Dëne Sųłıné, Inupiaq, Zuni, Hupa, Sm'álgyax, Nisga'a, and Dogrib alphabets, several proposed alphabets for the Venetian language, and the ISO 11940 romanization of the Thai ...