In metaphysics the merger of the two, the balanced participation of both is represented by the circle upon the cross, with the arrow leading down and away from both. This depicts the action which emerges from the center, the movement of the two forces, as well as the grounded centralization and focus of both energies combined.Posted by ulli (here)
In astrology the symbol for masculinity is a circle, with an arrow pointing upwards and to the right. Mars, the warrior.
This shows motion, action. In the I Ching it is repesented by the first hexagram, The Creative.
The symbol for femininity is a circle sitting on a cross. Venus.
This symbol shows stillness. In the I Ching it is the second hexagram, the Receptive.
If the masculine symbol is to be considered in a phallic sense, the unified symbol indicates the inert - but still present and ready/able to spring to action - aspect of the male. Additionally, it suggests that while the Masculine aspect directs the movement away from the Feminine, they are united in purpose and action and the movement occurs as a unit.
On a personal note, allow me this depiction; in My house, the feminine is that which creates the meal, while the masculine is that which does the dishes. ^_~
Sorry for all the edits, I keep thinking of additions!