I know it really doesn't matter, but I'm curious as to why some people refer to a camera/film as 4x5 and others 5x4 (or 8x10 vs 10x8, etc). Is it a cultural thing (I notice a lot more English and European than American photographers call it 5x4).

It is a cultural thing. The US is and Japan is 4x5. Europe is the opposite. But apparently not with metric as we all have 9x12 plate cameras.
Actually inch measurements in this context have little formal status outside the USA and dimensions in the rest of the world are given in centimetres.
It's not just a camera thing. Graphs are usually expressed in x (horizontal) then y (vertical) terms as are on-screen co-ordinates when I do CAD on a computer.
Being British, obviously 5x4 is correct and everyone else is wrong!
Not in the U.K. Although they tried to make us fully metric starting in the mid 1970s, it didn't happen.
Items sold in shops by weight or volume are now sold in Kg or litres but all of our road signs are in miles or yards and the speedometers in our cars are in MPH.
People of around my age (mid forties) and older tend to use both systems for distance measuring. If I am designing or building something small I will use millimetres. If I am working on a house it will be in feet and inches.
Where metric measurements for distance are used here, it is millimetres and metres. The centimetre is hardly ever used and the decimetre is even more scarce.
http://www.bwmaonline.com/Metric Culprits.htm
Steve.
It finally failed when America found out a baker's dozen would be 10 instead of 13.

As a Brit living in America I seem to use 4x5 and 5x4 to suit my audience. That's true of many terms - 'lift' vs. 'elevator', 'street' vs. 'road', but not when I'm driving![]()
but not when I'm driving

No. Hopefully you drive on the right which is the proper way to do it regardless of which country you are in!
Steve.

I put up a crew from England and took them to a supermarket where half of them surrounded a product display, laughing to tears at the selection of fanny packs. Never found out what was so funny. :|
I was a PAX with a Colombian pilot driving, (Avianca, flew 757s) when he almost drove into the bar we just left. He was driving on the left (this was between Medellin and Rio Negro) when a truck appeared coming right at us. Luckily he lost control and we left the road altogether and he found the breaks.
And yet lumber in England is sold as 2x4s not 4x2s, etc.![]()
I put up a crew from England and took them to a supermarket where half of them surrounded a product display, laughing to tears at the selection of fanny packs. Never found out what was so funny. :|
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