What I mean by this is, if I say I'm in Algebra 3 and Geometry 2, will people understand? I see a lot of things (Radio, internet, etc...) saying that people are in Algebra [insert number] and it got me thinking if they were standardized.

Are they?

If you go to certain parts of the country, yes, algebraic theorems will change. For instance, in Arkansas, you plus your cousin is not insest, it's actually good fun.

I'm not sure about the US, but they aren't standardized in Canada.

I believe high school graduation requirements are standardized by state. Each school within the state might have a different name for their math classes, but the general curriculum should all be the same. As for across states...well, OP you're in Minnesota, right? I went to high school in Ohio. I took these math courses:

Algebra 1 (9th grade)
Geometry (10th grade)
Algebra 2 (11th grade)
Trigonometry (11th grade)

(3 classes needed to graduate, I believe. Dumber people took something called Algebra 3 instead of Trig if they needed a class to be stuck into).

And then I took two college credit classes my senior year that were basically pre-calc.

But I also think after I graduated, they moved geometry to 9th grade, so who fucking knows. I'm pretty sure it's a state standardization though.

I think this is the new U.S. standard:

Elementary algebra
Algebra 1
Algebra 2
Geometry
College algebra
Trigonometry
Calculus
Calculus 2
Calculus 3

Statistics exists somewhere between Algebra 2 and Calculus 3.

I believe students in U.S. are required to take Algebra 1&2 and Geometry before graduation.
Personally, I think it should be bumped to Calculus.

I haven't seen exactly what my schools' curriculum has offered in this thread yet so I'm going to say no.

I think this is the new U.S. standard:

Elementary algebra
College algebra
Calculus
Calculus 2
Calculus 3

Statistics

That's a list of courses my high school did not even offer, so that is hardly a list of standards.

High schools offer up to Calculus 1. After that, they tell kids to go to colleges. I believe higher courses can apply toward a mathematics requirement in high school, however.

People will most likely not understand if you say Algebra 3.
If you say linear algebra versus matrix algebra, then yes.
Be more descriptive, and you'll get your point across almost anywhere.

AP Calculus can remove Calculus I and II requirements, at least for my uni.

I am just telling you my school did not offer calculus, so it must not be a standard course. The highest the school really went was trig, and there was an AP Precalc class for a year or two but I think they got rid of that. I took two pre-calc courses through a community college.

This, except it was called adv. alg. and trig., but that was 2 years ago, so it may have changed,