The word "symmetric" refers to something that is balanced or identical on both sides. It means that if you were to divide or cut something in half, the two halves would match or mirror each other. Full definition
Mooloo — One of my strong objections to the likes of Ward is that they are so patently not symmetric in their interest in protecting consensus science. (climate-resistance.org)
The PlayBook, on the other hand, runs a 1 GHz Dual Core Processor and the BlackBerry Tablet OS, with symmetric processing and 1 GB RAM. (newgadget.org)
I added cornstalks to both sides of my front door to give a more symmetric look to our fall front porch. (lehmanlane.net)