def decode_topic_name(encoded: str) -> str:
    """
    Reverses ``encode_topic_name``.

    :param encoded: the encoded SNS topic name
    :return: the decoded channel name
    """
    decoded = encoded
    decoded = decoded.replace("_WCD_", "*")
    decoded = decoded.replace("_FWS_", "/")
    decoded = decoded.replace("_DOT_", ".")
    decoded = decoded.replace("_COL_", ":")
    decoded = decoded.replace("_LT_", "<")
    decoded = decoded.replace("_GT_", ">")
    return decoded