How to write the backslash antislash symbol '\' with android default keyboard

Back slash on android

It is actually easy to do once know it. Go to the symbol keyboard by using the "12!?" button and then go to page 2 of the symbol keyboard by using the 1|2 button (this is what people generally miss).

Here the 12!? is the second button on the bottom line

Please notice the 1|2 button on the second line from the bottom (on the left of '!')