I can't say for all calculators, but on my TI calculator, it is the number of digits after the decimal place:
type 2.0 enter fix 5 and 2.00000 appears.
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Input is when you type with the calculator
There are many issues that you may be having with the calculator. You can call Texas Instruments Customer Support at 1-800-842-2737 for general questions regarding your calculator.
It means Error. If you try to divide a number by 0 it should give you the E. Also if you try to multiply numbers that will give a larger number than the calculator allows. I believe exponential calculators fix this by giving you a exponential answer.
What does 4e-6 mean
memory/recall