Return the character map used for a given font.

    Returns
    -------
    return_value: dict
        The dictionary mapping the icon names to the corresponding unicode character.

def charmap(prefixed_name):
    """
    Return the character map used for a given font.

    Returns
    -------
    return_value: dict
        The dictionary mapping the icon names to the corresponding unicode character.

    """
    prefix, name = prefixed_name.split('.')
    return _instance().charmap[prefix][name]