def get_symbol_freq_in_senteces(symbol, sentences):
    """

    :param symbol: The symbol which frequency we calculater
    :param sentences: a list of the sentences, representing the document / search space
    :return: the number of occurrences of the given symbol among the words in the search space.
    """
    freq = 0
    for sentence in sentences:
        for w in sentence:
            for char in w:
                if char == symbol:
                    freq += 1

    return freq