Right-click the folder you want to add an Emoji title to

Right-click in the text field and select "Emojis and Symbols". Find an emoji you want to use.

Click "OK" to save. \
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REMINDER: Your folders, if organized alphabetically, will alphabetize based on the name of the emoji (if the emoji is the first thing in the title like below.)

Google Drive is a cloud-based storage and synchronization service developed by Google. Learn how to upload files, videos, and others to Google Drive, share permissions, and more. Other tools in Google's suite of productivity include Docs, Sheets, and Slides, enabling real-time collaboration and easy access from any internet-connected device. Key features include file sharing, version history, robust search, offline access, and seamless organization.

Google: Renaming Files and Folders