What is the meaning of Tl?

ISO 639-1 language code for Tagalog.

Abbreviation of timeline.

(used to represent the sound /ʎː/ in Eastern Catalan and /lː/ in Valencian. May be written tll, especially in Catalonia.)

abbreviation of teelusikka (“teaspoon”); tsp

A letter of the practical Hadza alphabet.

in or into the

A letter of the Tlingit alphabet, written in the Latin script.

Source: wiktionary.org