def is_feature_icon(pull_req_data):
    """
    Check whether the pullData is a feature:icon PR.
    :param pull_req_data - the data on a specific pull request from GitHub.
    :return true if the pullData has a label named "feature:icon"
    """
    for label in pull_req_data["labels"]:
        if label["name"] == "feature:icon":
            return True
    return False