30:41 · The sign is common in modern ideography. It is used on videotape recorders indicating the switch for record. If we look at this more closely, however, we discover that it is that denotes record, and that stands for stop. Both and occur on appliances.
    The similar structures and denote switch for recording with reduced noise.
    In astrology is used to denote the fixed quality, the fixed signs, the fixed quadruplicity. The quadruplicities or qualities divide the zodiac into three groups of four signs each. The signs that begin with the cardinal points of the ecliptic, i.e. the cusps of Aries, ; Cancer, . Libra, ; and Capricorn, , are known as the cardinal signs and symbolized by , a sign for beginnings and maxima. Individuals who have many planets, or the sun or moon, in any one of these signs in their nativity are believed to be more enterprising, creative, self-assertive and independent than persons with other nativities.
    Those signs that follow immediately after a cardinal sign in the zodiac, i.e. Taurus, . Leo, ; Scorpio, ; and Aquarius, , are known as the fixed signs, symbolized by . Persons stamped with fixed qualities can be recognized by such characteristics as consequential behavior, loyalty, trustworthiness, respect for traditions, patience, endurance, and goal orientation.
    The final group, the signs that follow after the fixed signs and appear just before the cardinal signs, is known as the mutable signs. These are symbolized by . The signs are Gemini, . Virgo, ; Sagittarius, ; and Pisces, . The keywords for those personalities that are "coloured" by these signs are adaptability, ability to make a little go a long way, flexibility with words when in company, ease to learn new things, and ability to understand parties in conflicts.