mostly anything last i checked
The following symbols can not be used in a windows file name:\*:?/>
Chemical symbols use one or two letters from the name of the element.
I don't see the symbols you are asking about, but it's #
Search companion;)
File extension. Such as .docx, .wmv, .jpg
Yes you can name a file (class if you use eclipse) java or even have java in the name.
A file name is the main name given to a file, such as document.docx. The file extension, represented by the characters after the dot, indicates the type of file and helps the operating system identify which software to use to open the file. For example, in document.docx, ".docx" is the file extension indicating that it is a Microsoft Word document.
It depends on the filesystem, but modern filesystems will allow this.
Use the ASCII codes.
File Name
Use the help (F1).
It uses file extension and in some cases meta file information.