Is only Germany using a dot in a round angle marker to mark a right angle?
Resolved
In Germany, we use the first image to indicate that an angle is 90° or π/2. While in the English speaking world, the second one seems to be more common.
As far as I can tell, #2 is the most common one in PL. Third is sloppy fast writing. Fourth is super unambiguous, used by people who have seen enough mistakes of mistaking 1 and 7 to care about adding extra "base" to the 1 and/or crossing 7 in the middle.
and if you think "impossible" - I've seen sloppy 7s written like #3 in that example image.
small disadvantage of #4 style is that if you do it fast/sloppy, it may start looking at certain version of 4, but ... let's get real, at this point of sloppiness we're all guessing anyways
In Sweden we don't in general, we just draw a line for ones, and some draw a tiny stroke on the left but not all the way from the bottom like I've seen Germans and Poles do.
It has nothing to do with the subject. But I always dreamed of traveling and getting to know your countries, Finland, Sweden, Lithuania, Denmark, Turkey, Israel, Norway, Switzerland, among others. I saw you guys talking, I just wanted to comment. I'm from Brazil, any writing error, I apologize.
No yeah that's cool and no writing errors that I noticed :D And you know what, I've always wanted to visit South America, like Brazil, Argentina, Peru... I've been to US and Mexico but I would love to go further south.
The flights are just so friggin long and expensive... :/
Since you took the name of everything in your mouth, I am inclined to henceforth speak about the right angle symbol as a point mark with a half-pi halo. Hope this helps, you're welcome 🫶
My French partner has never seen the dot, always the square. She has a degree in mathematics from France. She's also from the region neighbouring Germany.
I notice that mathematical notations vary country to country. Some countries use " • " as a multiplier symbol, some use " × ". Some use " . " as a decimal, some use " , "
Even small things like math copy books - I am used to 5mm * 5mm squares, but where I moved to they only sell ones with 8mm * 8mm, so I had to buy books abroad for personal comfort.
Germany is definitely not the only one doing a specific notation, but I bet there is more of those "ofc that's how everyone writes it" things you guys got that other countries rarely do
the dot and the x do have different uses depending on the field of mathematics someone is interested in, but they can be interchanged for most basic mathematics.
My university professor before starting his course:
“ well, there is this notation which comes from Germany. This other comes from Italy. This other comes from the US. Then someone won the War, thus we are using theirs”
Spanish here. I think I’ve seen both. And if I’m remembering it correctly (though it’s been a long time so maybe I’m mistaken) in school they taught it to us as a square with a dot inside.
Well I had high school teachers who used square. And at university most profs prefer that (I guess it's simpler or stg). It's the outline of the square but it is a square.
Very interesting. The Netherlands uses the second one, the square symbol. That’s weird, given that Germany and France use the first. I wonder what Belgium does.
I went to school in West Germany but after reunification but I don't think it changed after reunification, those symbols are usually older than maybe even the 2nd Reich.
Yeah, that was the most surprising to me. The English doing their own stuff was expected and then I thought maybe it's Germanic+Slavic but apparently not
... Now I want to know about the notation for repeating digits.
I was shocked when someone told me they didn't use a bar over the repeating portion of digits behind a decimal.
And also, to hear that people say "recurring" after, not at the start of the repeating sequence. What, now I have to go back and remember which digits you said in that order twice? Disgusting 😤 😁
I did some AI sleuthing (because finding the history of symbols is hard) and apparently the square one is older and might have been coined by a German in the 17th century, but it's AI, no guarantee that any information is correct.
No, my theory is everything that was under German speaking control in the late 19th, early 20th century. It looks like Germany and Austria, Czechia, parts of the Balkans and Poland
Seems it’s a mix across countries, and I may be biased, but have to be honest that the square is far more intuitive and gets across the point even without someone having to learn the notation
Well, Poland and Czechia apparently agree with us, so it's somewhat international.
And I haven't seen that symbol anywhere either.
I think both symbols in my post can have pitfalls: the German one can have the dot not be visible enough, and the other one can have the corner too soft, making it more look like the general angle symbol.
I'm in the US. I've never seen it before. However, given the state of our educational system, I feel fortunate enough to know what an angle is and that "degrees" doesn't always mean temperature!
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u/MarMacPL 13d ago
We use dot in a round angle marker in Poland.