What logo has an arched line with a green like ball at the end?

The logo you're describing sounds like the one used by the popular messaging app WhatsApp. It features a stylized speech bubble with a phone icon, and the arched line may represent the speech bubble's outline, while the green ball at the end could refer to the circular part of the phone icon within the logo. This design emphasizes communication and connectivity, which are central to the app's functionality.