You've probably seen these on packaging or elsewhere - it is a 2-D barcode. Because it is two-dimensional, it can encode far more information than the one-dimensional kind (like the UPC codes you see on virtually everything now).
In the modern world, there are apps for your smart phone that can interpret these symbols using the phone's camera. If you have one, try it! This one encodes a URL for a website.
If you are making boat cards, you might want to consider putting one of these symbols on the card somewhere (I put this one on the back of ours). By doing so, you eliminate the need for reading tiny type and remove the possibility of making a typo. You can find any number of online apps for generating the QR code of your choice - just Google "generate qr code".
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