It is the keyboard speed. Usually referring to someone involved in data entry rather than text entry (where the speed would be in terms of words per minute).
This may look like a pretty good speed but what matters is not the key depression rate itself, but the speed of correct entries.
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Kitni wpm speed Hui
Well, isn't that a lovely question! 4000 key depressions per hour simply means pressing a key on a keyboard 4000 times in one hour. It's a measure of how quickly you can type, and with practice, you can improve your speed and accuracy. Just like painting, with patience and dedication, you can master the art of typing!
meaning of definition
Hold the bottom left button as you turn on the key.
If you have a scientific calculator, there should be a key to input numbers in scientific notation. This key may be labeled "E" (uppercase E - the lowercase "e" means something different) or "Exp". In this case, press 1, EXP, 12 (meaning, 1 x 1012).