51:6 · These two signs both represent the astrological aspect sesquiquadrate, denoting that two planets are separated in the zodiac by four and a half signs, i.e. an angle of 135 degrees.
    Semiotically the sign is a combination of the sign indicating 45 degrees (half of a square's 90 degrees), and the sign for a square, i.e. a right angle, 90 degrees.
    This aspect is considered to be a weak and slightly disharmonious aspect in the birth chart or natal chart (horoscope).