what does parenthesis mean in guitar

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1. What does de parenthesis on the tab mean? : r/guitarlessons

   

2. What do the parenthesis mean? Thanks!! : r/guitarlessons

   

3. What does parenthesis mean in tablature? : r/ukulele

   

4. What does parenthesis mean in tablature? : r/ukulele

   

5. The parenthesis by the 5 and 6, what does that mean? : r/guitarlessons

   

6. Parenthesis vs Parentheses: What's the Difference?