The first is the i-button which opens the Property Inspector. There you can change the object's size, colour, angle and x/y/z values. If the object is from the Brands catalog, then the size and the colour values could be locked when there are no variation for this product.
The second button is the 'Copy button' - this is especially useful if you are going to use the same object with these exact measurements several times. For example, to draw fence around your house or if you have standard windows at home.
The third button is for the Mirror function - when you use it, you can get a mirror orientation of the object - there are four options as shown below. This function is especially useful when you wish to change which way to open doors or windows. The last button (the trash bin) is the 'Delete button'.