Some Tek scopes had curve-tracers, and one of the principal characteristics of FETs is their conductance - measured in Siemens (S). Hence it might not be unambiguous on a Tek display!
Nowadays, "S" often means samples, as in S/s. While the purist in me still prefers "Sa/s", I don't find "S/s" so visually jarring as "uS".
So, I hope your spectrometry software never has to display anything w.r.t. samples.