horizontal and parallel lines together is the well-known
mathematical equals sign meaning is the same as. The uniting and linking quality of
is, so to speak, doubled, signifying a similarity
in one dimension, that of quantity. The ideogram has a similar meaning
in some other systems, such as geometry.
In astrology is used for the element of air. This astrological element, to which belong the zodiac signs of Libra, Gemini, and Aquarius, is not identical with the alchemical air element, nor is it graphically symbolized in the same way. Persons strongly influenced by one of the air signs tend to use their intellect, or their personal system of ideas, as their primary means of recognizing and ordering their environment. In astrology, the opposite of the air element is not the earth element, as in alchemy, but the water element, that influences the individual to experience his or her surroundings primarily through emotions and feelings.
In the British system of hobo signs means here they give you a place to sleep for the night. In meteorology it can mean thin mist.