Envelope

via free-horoscopes.com :

"

Analogy MERCURY / JUPITER

The Envelope is formed by a Mystic Rectangle with the addition of a Minor Grand Trine. In this configuration, the sextiles make the chart more dynamic, with the result that it is easier to identify opportunities as they come up. The Envelope eases communication, mutual assistance, self-expression, travelling and social life."

source: https://www.free-horoscope.com/astrology/low-down/patterns-astrology.htm