# What does this schematic symbol mean? (Circle with an arrow in it)

I've been looking at the schematics of the LM386 amplifier, but there is a symbol I don't recognise, it looks like a circle with an arrow in it (but it's not a voltage generator of course), can someone tell me what it means, please?

The whole schematic:

• Yes, I know the common symbol, it just looked different on this one, because the arrow isn't "floating" inside the circle, like it is commoly depicted, I just thought maybe it means something else, but I guess not, then. Sep 19 at 7:42
• Sometimes it is 2 circles, sometimes arrow is on outside and I guess sometimes connected. Sep 19 at 20:33