What are the vertical lines on the left side that show a block of code called?

Question

IDE

In all editors and ide's there are vertical lines that indicate a block of code, whether it's an if or a function, is on the left side. What are their names?

And if anyone knows, do they show code blocks in parenthesized languages ​​like sass, jade?

Answer 1

In English like Indent Guides. At least for VS there is a plugin called that.