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It is possible that the question is incomplete or lacks information to answer it accurately. However, I will try to answer it assuming that the question is about folk guitar string notation.

In general, the notation for guitar strings is given by their thickness in millimeters. So, if the guitar string in question is 0.27 millimeters thick, that means it is probably a light gauge acoustic guitar string.

However, it is important to note that guitar string ratings can vary depending on the manufacturer and geographic region. Therefore, it is recommended to check the manufacturer's notation to be sure of the string thickness match.