What does impedance in datasheets mean?

Question

Can anyone explain impedance in a datasheet? What does this mean:

(50 uH + 5 ohm) || 50 ohm

Line impedance stabilization network (LISN). Like this one : schwarzbeck.de/Datenblatt/k8124.pdf.

Answer 1

If you post the datasheet that you're reading I could answer it with more confidence, but what you wrote here can be read as a \$50 \ \mathrm{\mu H}\$ inductance in series with a \$ 5 \ \Omega\$ resistance and all that in parallel with a \$50 \ \Omega\$ resistance. Like this:

^{simulate this circuit – Schematic created using CircuitLab}