Moe icon mail

You're referring to the Moe! mail icon!

The Moe! mail icon is a popular symbol used to represent a message or notification in various forms of media, particularly in anime and manga. It is often used to indicate that a character has received a message or notification, and is typically depicted as a small, stylized envelope with a red "!" symbol on it.

The Moe! mail icon has become a recognizable and iconic symbol in Japanese pop culture, and is often used in a humorous or ironic way to add a touch of whimsy or playfulness to a scene or conversation.