What is a Transcription Turntable


My Linn LP12 is labled a trascription turntable. What does this mean in audio terms VS. a regular turntable?
soundwatts
Just going from recollection on the playing time, Eldartford. Longer may well be true, and my recollection may be for 16" 78s. The speed issue was also all over the map from 16 rpm to 90 rpm, and playback allowed for all of that variance. Interestingly to me, KAB still manufactures a "transcription" turntable that will manage those 16" discs and allow for infinitely adjustable speed control throughout this range.
.
Post removed 
Looking for help to identify what was likely a very high end "transcription turntable" in its day. Tonearm has "PC" in a circle logo. I can send photos if anyone cares to respond to this. Thanks!!
The disks are impressive to see. There was one in a junk shop that just seemed huge when you held it in up ... with RCA and filligree on one side and grooves on the other. In red vinyl.

I really should have bought the thing!