I think every subculture has its own slang. When I worked in the industry, diodes did not have cathodes -- they had business ends. And "
That capacitor", said in the right tone of voice, carries a delicious suggestion of
infamy which will not be lost on anyone who has seen the devastation it can wreak if leaky.
Even if you were trying to use strict scientific terms, it could still equally be described as an audio coupling capacitor or a DC blocking capacitor!
It's common courtesy to define a term when first using it around someone who may not be familiar with it
says she, who is recently guilty of forgetting that not everybody has studied physics to quite the same level. But it's not as though this forum is a secret society whose members know one another by their special words. If it was, there would hardly be an open, sticky thread on the subject, would there?