def append_node(node, symbol):
    """
    Return the appended node. Append a symbol to the node.

    :param node: The node that will be appended to
    :type node: list
    :param symbol: The symbol that is appended
    :type symbol: str
    :return: The new node
    :rtype: list
    """

    # Create a list with the symbol and append it to the node
    new_node = [symbol]
    node.append(new_node)
    return new_node