It's a symbol layer that shows intention having symmetrical parathesis on the home row.
Simplifies on keeping the main symbols in the same columns of the English layout but a row below the number row for easier reach.
Below the home row we have quick access to the common symbols outside of the number row that are also used in a lot of languages like Portuguese, Spanish, etc.
Most of my layers have minor changes from Miryoku layout keeping the philosophy intact, but this layer is the one that completely changes that.
Uses the modifiers on the left thumb because the home row can't have it since those keys are already modified.
The right thumb keys are empty because the layer is triggered from the right thumb.