scientific calculator
Calculator designed to execute mathematical operations specific to science and technology.
cursor movement keys 
Keys used to move the cursor around the screen.
result line 
Part of the screen that shows the solution to the problem.
entries line 
Part of the screen that shows the problem to be solved.
specific operations 
Specialized calculations include square root, trigonometry and logarithms.
basic operations 
Basic calculations include adding, subtracting, multiplying and dividing.
access to the second level of operations 
Key used to select a second function controlled by a key.
second level of operations 
All the supplementary functions listed above the keys and accessible using the access to the second level of operations.
first level of operations 
All the operations directly controlled by the scientific calculator keys.