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That's true, it's a bit of an anachronism. But everyone knows what it means.

Like skeuomorphism. Nobody uses floppy disks anymore, yet the floppy logo is universal for "save".

It's depressing that the various rounds of Win 10 logos floating around all use the floppy-for-save concept. Floppies haven't been in vogue at all this century.

But "floppy for save" has been ubiquitous. Its not so much a skeumorph as a well-recognized ideograph.

The phrase makes literal sense. Radio is a physical connection. Computers can be built without the wireless transceivers in order to avoid that physical connection.

As long as we're being overly literal and pedantic, I'd like to point out that wireless connections are still physical, in that they utilize physics to make the connection.