[bitbake-devel] What does the "fn" represent for in "<fn>:<taskname>"?

[kk]

In commit:
    2c88afb60da54e58f555411a7bd7b006b0c29306
uses "<fn>:<taskname>" as the ID for tasks rather than a number, I know
taskname represent for, but the <fn> I don't understand, does it means file
name or function name?

Thanks
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