> For the complete documentation index, see [llms.txt](https://docs.metacopier.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.metacopier.io/features/basic-features/permitted-symbols.md).

# Permitted symbols

This feature allows you to control which financial instruments can be traded by your account.

* **Whitelist**: By using a whitelist, you can create a specific list of symbols that are allowed to be traded. Only the symbols included in this list will be eligible for trading, and all other symbols will be restricted. This is useful if you want to focus your trading on a select group of instruments.
* **Blacklist**: Conversely, the blacklist enables you to specify symbols that are not allowed to be traded. All symbols not included in the blacklist will be permitted for trading. This approach is useful for excluding certain instruments that you consider too risky or outside your trading strategy.

For examples of how to use regex, [please look at this page](/tutorials/regex.md).

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