What is really wrong when someone says that the flag is "upside down" is that "the flagpole is on the wrong side". The flagpole should be on the same side as the top left THICK white diagonal stripe. It doesn't matter whether the flagpole is on the left or the right of the flag, as you look at it, as long as the top white diagonal next to the flagpole is the THICK one (as opposed to the thin one).
Regarding the original question, "What does an upside down union jack mean?", I always took it to mean, if flown intentionally upside down, that it was a sign of distress.
Next to the flagpole, reading top to bottom, the top diagonal should be THICK white, red, THIN white
and then the bottom diagonal should be THICK white, red, THIN white.
It depends on the circumstances... Flown upside-down deliberately - indicates a distress signal. However - because of the subtlety of the design - it's often wrongly flown inverted on buildings etc.
When the British Union Flag is flown upside down, it is a distress signal. Unfortunately, and I find this very annoying, not everyone know how to fly the Union Flag correctly. I, personally, would like the Union Flag to be symmetrical , so it didn't matter which way up it was raised. Or, I would like the Welsh Red Dragon to be added in the top left corner - so there is no excuse to fly the Union Flag upside down!
In mathematics, an upside down A means "for all".
A upside down rainbow means cheese or tacos
It depends. In some countries it is a distress signal, in some countries it is frowned upon (Australia for instance) while the Philippines military use the national flag upside down as a war flag (and is the only country to do so). In some instances (some international events!) flags are flown upside down because of ignorance or stupidity. This has been known to happen with the Union Jack, which, while it looks symmetrical, is not, and easy to hoist incorrectly.
Answer it
I'm not sure what you mean by 'special name', but the official name for the British flag is: Union Jack
The Upside down T symbol indicates perpendicular lines.
pnworhd is an upside down pyramid. If you take pnworhd in script and turn in upside down you will get pyramid
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Anokatoprosopus means upside-down face (i.e. some aliens or monsters have upside-down faces).
It means un-polo if it's an upside down p with a small diamond next to it.
The upside down purple triangle was actually used to identify Jehovah's Witnessess