What is the font for the Arista Records logo?

Don't know such a font. Possibly custom and heavily. Best I could say would be having a look to these 2 sections at DaFont http://Techno > Sci-fi and http://Techno > Various.

I would think this is art and not a font.

What is the character map of this logo?

What do you mean with ‘character map’?

Because I want to know the font's character map for this logo.

It is not a font - it may have started as something based on type but it is now art - vector art as in an Adobe Illustrator file.