Dot (.) symbol automatically added when pressing the space key 2 or more times I have seen many times when I type in WhatsApp and press the space key 2 or more times, a period symbol is automatically added. But after I press backspace once, pressing space many times won't add the symbol.

How to remove that automatically added period (.) symbol in WhatsApp and other applications?
That is not only on WhatsApp. It is everywhere when you double click space bar, a dot will occur. You need to configure it with your keyboard settings on Android, or simply reset your keyboard settings.