Phoenix.LiveView.Helpers.sigil_L

You're seeing just the macro sigil_L, go back to Phoenix.LiveView.Helpers module for more information.
Link to this macro

sigil_L(arg, list)

View Source (macro)

Provides ~L sigil with HTML safe Live EEx syntax inside source files.

iex> ~L"""
...> Hello <%= "world" %>
...> """
{:safe, ["Hello ", "world", "\n"]}