This assumes you have already configured the aws command line tool. If not, check out my article on Getting Started with the AWS CLI.

A Simple Notification Service (SNS) Topic can be used to create notification alerts, such as an email notification.

The aws sns list-topics command can be used to list your Simple Notification Service (SNS) Topics.

aws sns list-topics

Something like this should be returned. 

{
    "Topics": [
        {
            "TopicArn": "arn:aws:sns:us-east-1:123456789012:myTopic.fifo"
        }
    ]
}

The aws sns delete-topic command can be used to delete a Topic.

aws sns delete-topic --topic-arn arn:aws:sns:us-east-1:123456789012:myTopic.fifo