<prompt> Cu T 200 is so called -200 sqmm of Cu2 over loop200 mm of Cu over loopFor 200 days, Cu concentration does not changes200 sqcm of Cu over loop  <response>: Ans. is a i.e., 200 sq. mm of Cu over loop o The numbers included in the names of the intrauterine devices refer to the surface area in sq. mm of cooper on the device. 