I've been noticing icons lately that sooner or later will be outdated.
Let me give you a few examples-
In MS Word, when I want to save a document, I click the diskette icon.
It's actually been years since I used the 3.5" diskette, but it's still
associated with "Save."
In a meeting last week we used the speaker phone for a conference call.
The on and off buttons showed a telephone handset oriented either
vertically (phone off receiver - On) or horizontally (phone on receiver
- Off). The icon for the phone was the one I remember as a child- with
the round ear and mouth piece that sat on top of the phone cradle and
connected via the spring-like cord. (see http://en.wikipedia.org/wiki/Telephone#Telephone_equipment for the phone
I'm thinking of- the beige pushbutton phone's handset)
Also on this phone was a button for mute, which showed an old-fashioned
microphone with a slash through it. The mic looked like the one on David
Letterman's desk- large, with a large base and mesh covering.
It seems that some people under a certain age may have never seen these