Letter E
We could say that the letter E is the sign of the masculine gender.
Its opposite would be the letter A , the sign of the female gender. The sign of the neutral gender would be the letter O .
If we had a number of two digits ... when the tens digit is less than the unit count, the gender is said to be masculine. On the other hand, when the tens digit is greater than the unit's digit, it is said that the gender is feminine. But when the units and dozens are equal, the gender is said to be neutral.
An example:
For the two-digit number ... 52, the gender would be female.
For the number ... 25 the gender would be male.
For the number ... 55 the gender would be neutral