i am used to count some call this a manual calculator
it's also called abacus
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The Chinese invention that was the first calculator was called an abacus. It was invented sometime between 2700 and 2300 BC.
There is no such number on a calculator. If you see "R" on a calculator, it is probably some calculation - for example, conversion from polar to rectangular coordinates. Check the manual for your calculator.
The first calculator was never launched, because it was in fact a mechanical calculator.
The very first calculator ever used could be an abicus, an electronic calculator, or even your brain. The first calculator invented was the abacus.
Usually a graphing calculator should have all the capabilities you expect from a scientific calculator (and more, since it does the graphing). For more details, check the manual of your calculator if you already have one.