• 1st Row

1. abs : The absolute value of a number (e.g. abs(-5) = 5).
2. mod : From modulo. it's the operation to find the remainder of the division of one number by another.
               In python we use the symbol % (e.g. 5mod2 = 5%2 = 1).
3. div : Floor division returns the result of the division rounded down to the nearest integer.
             In python we use the symbol // (e.g. 8div3 = 8//3 = 2).
4. x! : The factorial of the number x (e.g. 4! = 24).
5. e : The Euler's number. A mathematical constant approximately equal to 2.71828.

• 2nd Row

1. sin : Sine of an angle θ in degrees (e.g. sin(90)=1).
2. cos : Cosine of an angle θ in degrees (e.g. cos(180)=-1).
3. tan : Tangent of an angle θ in degrees (e.g. tan(45)=1).
4. cot : Cotangent of an angle θ in degrees (e.g. cot(45) = 1/tan(45) = 1).
5. π : Archimedes' constant defined as the ratio of a circle's circumference to its diameter.
          It is approximately equal to 3.14159.

• 3rd Row

1. x² : x raised to the power of 2 (e.g. 4² = 16).
2. x³ : x raised to the power of 3 (e.g. 5³ = 125).
3. xⁿ : x raised to any power (e.g. 2⁴ = 16 ).
4. x^-1 : x raised to the power of (-1). The inverse of number x (e.g. 2^-1 = 0.5).
5. 10^x : Powers of 10 (e.g. 10³ = 1000).

• 4th Row

1. ²√ : Square root of a number (e.g. ²√144 = 12).
2. ³√ : Cube root of a number (e.g. ³√8 = 2).
3. √ : Any root of a number (e.g. ⁴√16 = 2).
4. log₁₀ : The logarithm of a number with base 10 (e.g. log₁₀1000 = 3).
5. ln : The logarithm of a number with base e (e.g. log_ee = ln e = 1).

• 5th Row

1. ( : Left parenthesis.
2. ) : Right parenthesis.
3. ± : Change the sign of a number.
4. % : Find the percentage of a number (e.g. 5% = 0.05).
5. e^x : Expotential function (e.g. e²=approx 7.389 ).

• 6th,7th,8th,9th Row

In these rows are :

-> The basic number buttons (0 to 9).
-> The basic math symbols (operators) (+, -, *, /).
-> The equal sign (=) and point (.).
-> Button DEL to delete one or more from the end of the entry.
-> Button AC to delete the whole entry.
-> EXP : Multiply any number with powers of 10 (e.g. 2 * 10 ** 3 = 2000).

• Konstantinos Thanos