The `block_start_string` attribute of the `jinja2.Environment` class in Python's Jinja2 template engine represents the string that marks the beginning of a block statement in a Jinja2 template. A block statement is used to define a block of code that can be overridden or extended in child templates. The default value of `block_start_string` is '{%'. This attribute can be modified to change the block starting string according to the specific requirements of the template.
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