Can an object name have a decimal point?

I simply want an object field to have a period or dot in the name on Firebase.

I see where it says invalid character but it seems strange to not be possible.

Thanks everyone

This is from Firebase documentation

If you create your own keys, they must be UTF-8 encoded, can be a maximum of 768 bytes, and cannot contain . , $ , # , [ , ] , / , or ASCII control characters 0-31 or 127. You cannot use ASCII control characters in the values themselves, either.