What is typing notification snapchat?

As an AI language model, I don't have access to current information about Snapchat features. However, typing notification on Snapchat is a feature that lets you know when someone is typing a message to you in the chat window. It appears as three periods next to the person's name or username, indicating that they are in the process of composing a message. This feature can help you anticipate when a message is about to come through and is a common feature on many messaging platforms.