>> To recall which side is the cathode

Wouter, it's very simple. With the diode pointing to the left the
symbol makes a 'K' at the cathode end

--K|---

With the diode pointing up, it's kind of an 'A' at the anode end

|
_
^
|

Or the way I used to remember it, until I noticed the above. With
'positive' flow, 'a' comes before 'k' (or 'c'). IOW voltage sees 'a'
before 'k'
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