!bangs in Brave Search can be used directly on Brave Search, as well as in the address bar when Brave Search is set as your default search engine. Here's an example:
!w hello world
When entered into Brave Search will search Wikipedia with the query "hello world".



Bangs on Brave Search

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Hacker News
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Amazon.com
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Twitter
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Google Maps
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npm
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Google
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Reddit
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GitHub
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eBay
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YouTube
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Google Images
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Wikipedia
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Ubuntu Packages
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Google Scholar