The “API symbol or donut” usually refers to the little ring‑shaped icon you see next to a stock/option/ticker in trading or brokerage platforms, and it’s there to quickly tell you how that instrument trades and what kind of data is available for it. In most modern platforms, that donut‑style API symbol typically conveys things like:

  • Whether the instrument is tradable via the broker’s API (e.g., can your bot or script place orders in it).
  • Whether price/quote data for that symbol is available via the API (real‑time, delayed, or none).
  • Sometimes the trading session status (active, halted, closed) or liquidity/market type.

Because the exact meaning is platform‑specific, you always want to:

  1. Hover over the donut icon in the UI and look for a tooltip.
  2. Check that platform’s “API” or “symbols legend” help page, where they list what each ring/segment or color means.

If you tell me which app or broker you’re looking at (e.g., TradingView, IBKR, Tastytrade, Thinkorswim, etc.), I can map out more precisely what that donut is telling you for that particular platform.