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Alright, let's take a look at another piece series that will be on the
board, and also what may be a side issue: battlefield promotions. The
movement rules we're using allow us to easily create promotion ladders,
which are an arranged piece series. So we will lay out a piece series to
be used on the board in ascending order of piece power, and that order
will be our promotion ladder. 
Let's consider the modern elephant, generic 'written' description of
AF, or a combination of alfil and ferz. It's lowest 'rank' is modern
elephant, written here as A/F, to indicate it moves once only, as either
an alfil or a ferz. It's board icon is an elephant with an 'X' on its
side. 
When it achieves promotion, by capturing a piece or crossing a line, say,
it becomes a 2-step piece, the [linear] shaman, which moves as either A or
F or moves twice, in a straight line, once each as A and F, in either order
the player chooses. The basic elephant with X icon gets a square box drawn
around the X, and it's written A+F. 
The next promo is to the bent shaman, which moves like the shaman, except
that it can change direction between the first and second step of its
move. The icon is the elephant plus X with a circle around the X, and
it's written A +/- F. 
The next is to oliphant, a linear, 2-step, modern elephant-rider,
symbolized as the elephant plus X with 2 parallel speed lines on its side,
written as A/F + A/F. 
The final one is to twisted knight, the bent 2-step modern elephant rider.
The board icon is the elephant and X, with a 'Z' [2 parallel speed lines
connected by an angled crossbar] on its side, written as A/F +/- A/F.