See also: SL, .sl, sl., S&L, Sl., s.l., S & L, and śl. Translingual Symbol sl (international standards) ISO 639-1 language code for Slovene. (General Alphabet of Cameroon Languages) a voiceless lateral fricative (IPA [ɬ]). Daba Pronunciation IPA(key): /ɬ/ Letter sl (uppercase Sl) A letter of the Daba alphabet. Hadza Pronunciation IPA(key): /ɬ/ Letter sl (upper case Sl) A letter of the practical Hadza alphabet. Mada (Cameroon) Pronunciation IPA(key): /ɬ/ Letter sl (uppercase Sl) A letter of the Maɗa alphabet.Wikiwand - on Seamless Wikipedia browsing. On steroids.