> For the complete documentation index, see [llms.txt](https://docs.thirddimension.exchange/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.thirddimension.exchange/portfolio-panels/synthetic-symbols.md).
# Synthetic Symbols
## What is Synthetic Symbols
**Synthetic Symbols** panel allows to create any non-standard instruments (symbols) or spreads that you can both trade and use as an indicator of the current market situation or market divergences.
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Spread trading is a strategy that simultaneously creates a long and short position for different assets, in order to reduce the risk of the entire portfolio. Each side of the spread is called a "Leg", which is necessary to set the weighting factor for, i.e. the number of contracts for buy or sell. A market-neutral position, which does not depend on whether the market will go up or down is obtained with a proper selection of these coefficients.
## How to Create a Custom Spread in 3rd Dimension?
For example, let's build a spread between different brokers within the same asset and see if there is a difference in prices. This is a classic example of Broker arbitrage.
* Open the Synthetic Symbols panel and click "**Create Synthetic**".
* Set the name for your spread and select a trading instrument.
* Click "**Add Leg**" to add another instrument. You can add an unlimited number of instruments by creating new "legs"
* Set the coefficients for each leg. In our example, we buy 1 lot of AUD/USD from the LMAX broker and sell 1 lot of AUD/USD from the OANDA broker.
* Click the "**Save**" button to calculate the received spread.
* Open the Chart panel and select your spread from the list of instruments.
