def map_booleans_ynu(target_val):
    """ Map boolean values to `Y`, `N`, `Unknown`.

    Args:
        target_val (any): value to check if it represents a boolean / indicator.

    Returns:
        str: `Y`, `N`, `Unknown`
    """
    if target_val in [False, 0, '0', 'f', 'F', 'false', 'False', 'FALSE', 'n', 'N', 'no', 'No', 'NO']:
        return 'N'
    elif target_val in [True, 1, '1', 't', 'T', 'true', 'True', 'TRUE', 'y', 'Y', 'yes', 'Yes', 'YES']:
        return 'Y'
    else:
        return 'Unknown'