Nine interlocked cross-like 12-membered rings which can be seen as 4 interlocked hashtag signs.
DIY post-printing steps are required to remove two support structures (front an back layer) which are needed because only up to 6 interlocked parts are allowed. But this model has 9. Thus, enjoy the DIY work or consider it as a part of the gift. Please refer to the 4x4 version which does not require any post-printing work:
https://www.shapeways.com/product/2KJ6F2ZAM/hash-tag-pendant