Transphase Eradication Rod
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A Transphase Eradication Rod (or TER) is a fictional device in the sci-fi Stargate universe.
Introduced to the SGC by the Tok'ra, it was originally designed by the Goa'uld as a device to help find and defeat the Re'tu. The TER has two functions, a scanning light which causes cloaked objects to appear (or at least those 180 degrees out of phase with our own reality), and an energy weapon capable of killing a Re'tu in one shot. The TER light has been shown to work not only on Re'tu, but on the personal cloak Nirrti used as well.
First seen in the second season episode "Show and Tell". It is often referenced when someone at the SGC orders a "TER sweep of the base".
The original Tok'ra/Tau'ri Kull Disruptors were mounted on TERs; the more familiar attachment to a P90 and other firearms only appeared later.