A DS-nEYEn in the Triangle

Star Trek DS9 5x08 Things Past

How are we gonna get through this triangle door (notice the 'sun' on top)

Oh it's a glowing eye in the triangle

It's a burning eye in the triangle

It's Dax's winking eye in the triangle

That's all folks!

Well not really, one more thing. Here's a kundalini caduceus which 'still gets used in the future' as a medical symbol, held by the (former) Shapeshifter (turned Solid, turned shapeshifter again) Odo.