lfn

(computing) Initialism of long filename. [(computing, chiefly Microsoft Windows) A filename where the filename itself, the file extension, or both, are longer than that possible with an 8.3 filename.]

Initialism of Lingua Franca Nova. [A constructed language created by C. George Boeree based on French, Italian, Portuguese, Spanish, and Catalan using either Latin or Cyrillic alphabets with grammar based on that of Romance Creoles.]