A natal chart displays the positions of the planets at the time and place of birth. It is also referred to as a birth chart or horoscope.
Transits
Transits are the current positions of the planets, as compared to your natal planets, and are interpreted as follows: the interaction between the current and natal positions can be interpreted as strongly related to the current events in your life, both external events as well as psychological transformations you are in the midst of. The timing of the transits (which can last weeks or months) is given in the first paragraph of the interpretation for the transiting aspect.
Progressions
Progressions are another way to look at the evolving positions of the planets, as compared to your natal planets, and are interpreted as follows: the interaction between the progressed and natal positions can be interpreted as strongly related to the current events in your life, both external events as well as psychological transformations you are in the midst of. The timing of progressions is slower than for transits, and is given in the first paragraph of the interpretation for the progressed aspect.
Compatibility Biwheel
Used to compare two individual's charts with one chart surrounding the other. With this technique you can examine how one individual impacts another by seeing which of your houses their planets fall in and by exploring the aspects between their planets and yours - also called synastry.
Composite Chart
A Composite chart is an astrology chart composed of the midpoints of two individuals' planetary positions. This technique is used to examine the relationship as its own entity.
Sabian Symbols
The Sabian Symbols were channeled in 1925 by Astrologer Marc Edmond Jones and psychic Elsie Wheeler in a park in San Diego. There are 360 symbols. These have subsequently been analyzed and studied extensively, see for example Dane Rudhyar's An Astrological Mandala, or Lynda Hill's The Sabian Symbols As An Oracle and have proven to be effective symbols for the particular degree of the (Western) Zodiac occupied by natal or transiting planets, such as the Sun degree of one's own chart, an indicator of character. Many use the Sun degree and the Moon degree of a chart but avoid the Rising degree as this could be one of several.