f_o4

Biohazard symbol rendered in a shiny metallic blue finish.
Free for your Discord server

What does the f_o4 emoji mean?

A shiny blue take on the classic biohazard warning symbol.

This emoji features a metallic, 3D-rendered version of the universal biohazard symbol in a striking blue color. It is commonly used in gaming, tech, or science-themed Discord servers to represent toxicity, dangerous content, or just to add a cool, edgy aesthetic to chat messages.

When to use it

  • Marking toxic behavior in a chat channel
  • Warning friends about a dangerous game play
  • Adding a cool aesthetic to server roles
  • Signaling radioactive or sci-fi themed content

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How to add this emoji

Add to Discord
  1. Click Add to my server above and pick a Discord server you manage (CommunityOne must be installed).
  2. Or download the file: open Discord โ†’ Server Settings โ†’ Emoji โ†’ Upload Emoji.
  3. Give it a name and save. You need Manage Server (or Create Expressions) permission.
Add to Slack
  1. Download the f_o4 image.
  2. Open the Slack emoji picker and click Add Emoji.
  3. Upload the file, name it, and save.
Add to Revolt/Stoat
  1. Download the f_o4 image.
  2. Open Server Settings โ†’ Emojis in Revolt or Stoat.
  3. Upload the file and name your new emoji.
Add to Guilded
  1. Download the f_o4 image.
  2. Go to Server Settings โ†’ Emotes in Guilded.
  3. Upload the file and give it a name.