Al gul

Basically, what we call "Arabic Numerals", including the number 0, have their origin in India. Europe got them from Arabic scholars, and therefore called them "Arabic".

The main factor is the decimal system of writing and having the concept of a zero in contrast to the odd, additive and subtractive writing of the Roman numerals, which didn't even know a 0, and made multiplication a pain and division nearly impossible.

What glyph is actually used for a one, be it a 1 or a ١, is absolutely secondary.

Looking at Wikipedia, we're talking about western Arabic numerals in Europe/USA (TIL). Did you use one of the versions listed here as Eastern arabic numerals? Briefly reading the history, eastern is more common across modern Arabic regions.
https://en.wikipedia.org/wiki/Arabic_numerals

I think your confusion is the other side of what the article was discussing.

The problem is, there have been a lot of number systems in the past. The one we currently use is based on the Arabic system. In common usage you would simply call them numbers. But in a technical sense, to distinguish from other numbering systems past and present, they're also called Arabic Numerals because that's their origin.

Clearly this ignores the fact Arabic is still around and using real Arabic numbers and that is both confusing and maybe problematic. But I think the technical reason it sticks around is to acknowledge their source and have a more specific term when there is a need

If you look at the Hindu-Arabic numerals first used in Europe in the middle ages, they looked very much like modern numerals used in Arabic. This is the modern set:

١٢٣٤٥٦٧٨٩٠

Some of those will look more familiar if you rotate them 90 degrees CCW.

FWIW this is by far less dangerous and aggressive than oxygen, which caused the first global mass extinction when it started to amass in earth's atmosphere (and plays a major role in the corrosion of iron you mentioned).
And yet people tell you to breathe in and out...

Dihydrogen Monoxide FAQ

And stop plants from drinking it too!

Brawndo's got what plants crave. It's got electrolytes.

zuchini is green squash now

My son just told me there is a complete wiki about DHMO. Something I'll investigate later...

Hear me out, maybe base 10 isn't the best counting system. Base 6 or 12 could be pretty nice. Not worth Nazis being in charge, but could be a nice change of pace.

They were angry before this and they'll have been angry if this was never mentioned.

For those willing to learn, there's an opportunity for a teachable moment

Dont forget it is a key component in both hydrochloric acid and making nuclear power plants operate.

Water? Don't touch the stuff.. fish fuck in it

I'm sorry but as a technicality none of the power used in a steam engine is derived from the dihydrogen monoxide. The chemical compound is used as a medium to turn thermal energy into kinetic energy. The thermal energy, likewise, is usually obtained from another source such as chemical, nuclear, or photovoltaic.

Thry say even small amounts are fatal in certain circumstances.

Yuck! It has no electrolytes!

You think that's bad, here's something to consider... The vast majority of them died within 24 hours of ingesting dihydrogen monoxide!

How about Brahmagupta's quadratic equation

tbf, they should teach about him. one of the most influential mathematicians in history and most people have never heard if him.