In past days, programmers would go into a bank and ask for a cash withdrawal of $0xF. And if you have no idea how much $F is then just read Hexadecimal.
It probably is slightly better than asking for $1111, which might result in you getting more than you really wanted - assuming your account could stand it. And if you don't get this joke you need to be reminded that
"There are 10 types of people in the world: Those who understand binary, and those who don't."
And once again if you aren't sure what 10 is all about read Binary.
It isn't so long ago that these skills were essential. But these times have passed us by.
Even resistor color codes aren't as important as they once were, with impossible-to-read surface mount components.
What would be the modern version of this cartoon? Or does technology no longer require geeky skills that creep into our "ordinary" lives.