This is a soft keyboard that is convenient for writing mathematical questions and expressions etc.
Numbers symbols alphabets and superscripts can be entered without conversion.
You can enter digits from 0 to 9 alphabets "abceimnrxyz" Greek letter "π" superscripts "⁰¹²³⁴⁵⁶⁷⁸⁹⁺⁻⁼⁽⁾ⁿ" and mathematical symbols "!?√#|%$°'"^:;∠⊥△∴∞∫&+±-~*×/÷=≠≒≡<≦>≧({[)}].".
If you press the key of the symbol continuously it switches to a different symbol.
If you press the key of the alphabet and Greek letters continuously it switches from lowercase letters to uppercase letters.

Please be aware that superscript may not be saved properly depending on the character code of the text file to be entered.
If it is UTF-8 of the standard character code of Android OS it can be saved correctly.
There is a possibility of garbled characters when saving with the standard character code of Windows PC.