A curved line above or below a group of notes tells you those notes should be played legato – smoothly, with no gaps between the notes. A slur is a legato line over a few notes which means they ...

Legato Merger Corp. III focuses on effecting a merger, capital stock exchange, asset acquisition, stock purchase, reorganization, or related business combination with one or more businesses.

Not to be confused with a legato slur, a tie joins together two of the same note. It tells you to hold the note once and hold it for the value of both, rather than playing the note twice.