△ can have multiple meanings depending on the context. The most common interpretations are:
Geometric Representation
In geometry, the symbol △ represents a triangle. For example, △ABC signifies a triangle with vertices labeled A, B, and C.
Astrological Significance
In astrology, △ symbolizes trine. A trine is an aspect in astrology referring to planets separated by 120 degrees, considered a favorable angle.
Summary
Therefore, △ generally means either "triangle" in geometric contexts or "trine" within astrological discussions. The specific meaning depends on the field in which it is used.