This coaster depicts the emblem of the 'Niners', Deep Space 9's resident baseball team from the DS9 episode 'Take Me Out to the Holosuite'
If you don't have a 3D Printer and you want one of these coasters please send me a DM and we can arrange for me to print one for you :)
Also check out my Etsy store - www.etsy.com/uk/shop/enterprisexddesign