Hi ​@tjsangster 

There is a limitation in displaying Unicode characters that fall outside the Basic Multilingual Plane (BMP), including unique alphabets like Shavian. 

• Despite uploading supporting fonts, these characters may appear as black boxes or remain invisible. Unfortunately, there's no built-in solution within Lucidchart to overcome this issue. 
• A reliable workaround is to create the desired text in a compatible program, export it as an image, and then upload the image to your Lucidchart document. 

This technical constraint is due to text rendering engine, which currently doesn't support surrogate pairs or non-BMP code points.

Hope this helps - Happy to help further!!
Thank you very much and have a great one!
Warm regards

Hi ​@tjsangster, Thanks for your post! Unfortunately, this isn’t currently supported in Lucid, but we’re very interested in your feedback and committed to continually improving our products. If you’re willing to share, we’d love to hear more details about your use case or what you’d like to see in this experience within this thread. I’ve also converted this post to an idea so that it’s visible to others within the Product Feedback section of the community - from here, they can upvote it and add details of their own.

Finally, for more information on how Lucid manages feedback via this community, take a look at this post:

Thank you for sharing your ideas and feedback in the community. Please let us know if you have any questions!