When you type @ symbol in a Google Doc, a smart chip shows you recommended information you can add like:

When you type the "@" symbol in a Google Doc, it triggers smart chips, which are interactive elements that allow you to quickly insert various types of information. Dates/Events (A) can be inserted directly from your Google Calendar, making it easy to reference meetings or deadlines. People (C) allows you to mention collaborators, linking to their contact information or Google profile. Files (D) enables you to embed links to other Google Drive files, such as Docs, Sheets, or Slides, providing quick access to related documents. Map locations (B) are not a standard smart chip option directly accessible via the "@" symbol in Google Docs; while you can link to Google Maps, it's not an integrated smart chip suggestion.