Mercury is perception. All information coming in and going out is a mercurial function. The androgynous heyoka commands language, all forms of communication, thoughts, manas, and interest. He/she reminds us that energy goes where attention goes and illustrates precisely how thoughts create reality.
Being the fastest moving of all the Planets, it is sometimes hard to track the subtlties of Mercury’s movements, but none-the-less, they are there. Flying between the evening and morning skies, going retrograde every three months, for three weeks, Mercury is ok being the third wheel. It is never bored.
In the horoscope, Mercury tells us about the functioning of an individuals intellect: the speed, the style, the processor, the RAM, the components that make us cognitive and intelligent. Never overlook Mercury in the chart. He, in many of the stories, gave us Astrology.