Where does “ISL” come from?

ISL (Translingual) comes from Icelandic Ísland, from Old Norse Ísland, from Old Norse íss, from Proto-Germanic īsą, from Proto-Indo-European h₁eyH- — ice, frost.

Ancestry of “ISL”, step by step

StepLanguageWordMeaning
1IcelandicÍslandIceland
2Old NorseÍslandIceland
3Old Norseíssice
4Proto-Germanicīsąice
5Proto-Indo-Europeanh₁eyH-ice, frost
Every word from Proto-Indo-European h₁eyH- →Every word from Proto-Germanic īsą →Every word from Old Norse íss →