I've never actually given thoise much thought, i had always assuemd they were just random table scratchings!
There doesnt seem to be any distinct form in the symbols.. well, none that i can see anyhow.
There are waves....I assume represent water. (movement)...and a dove (spirituality)....the middle symbol I cannot make out. I am looking at the Universal Waite...could it possibly be different?
I'm not sure if the first symbol is waves or mountains. There are a series of zig-zagging lines as in the aquarius glyph, but they do not line up as you would expect with water, and touch at odd angles, so they look like the mountains.
I have an enlargement of the card and cannot tell what the middle one is either. It does not seem to resemble much of anything
Given that the symbols are on the table next to the suit signs, my thinking was it could be a reference to the Aces. i.e. the mountains of the Ace Swords, the dove of the Ace Cups (but flying upward rather than downward). The middle on then may be suppossed to be something from the Ace Wands, and then the three mother elements would all be there....?