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Why does .map file have _variable names and not just variable names?

In embedded software, why does the .map file have _variable names and not just variable names?  A particular variable name in code doesn't start with underscore.   Then, why does this variable start with an underscore in .map file?

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8/22/2022 - Mon
Kent Olsen

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>> To avoid name conflicts
In embedded 'c' language source code, variable foo is defined.  In Executable and Linking Format(ELF) formatted .map file it's _foo or __foo.  What conflict is there?  Why not foo in .map file?


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