Laissez vibrer [Fr.] allow to sound, do not damp.

Laissez vibrer, or L.V. indications such as the one pictured above, are common notation practice. Instead of writing out a series of notes or chords together for what might be a long duration, the player is simply instructed, via a tie and the abbreviated ‘l.v.’ text, to let the note(s) ring out for as long as they would sound.
more >> “L.V. Symbols in Sibelius (Laissez vibrer) – Several Solutions”