schematics - What is the symbol on the supply voltage that looks like a shaded-in capacitor?

I am looking at a datasheet for NJM2073 (dual low-voltage power amplifier). On the fourth page, there is a sample circuit; right at the V+ input there is a symbol that looks like a capacitor. However, it looks like it is shaded in. What is that?

Answer

Intercontinental symbols for fixed capacitor from here:

and from http://www.learnabout-electronics.org:

and a very old one....