I came across this datasheet, and I am unsure what the CT portion means.
The datasheet does say that CT means center tap, but specifically in the image below what does the "10k CT" betweeen primary and secondary mean ?
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It means what it says. A transformer winding that is center-tapped has an extra connection (the center-tap) in the center of the winding.
Sounds circular, doesn't it.
This allows several options when using the winding. You can get half the voltage, or do impedance matching (you get a 4:1 ratio), or treat the center-tap as AC ground and get half-voltage signals that are 180 degrees out of phase.