The IC (Imum Coeli) is the lowest point in your chart, opposite the Midheaven. Where the MC describes the public role, the IC describes the private foundation underneath it.
What it represents
Family of origin. Childhood home. Inner emotional climate. The smell of safety. Anything that follows you home.
IC by sign
Cancer IC: home is sacred. Leo IC: a dramatic, expressive family. Virgo IC: tidy, anxious, particular. Capricorn IC: serious, structured, possibly cold. Pisces IC: dreamy or chaotic.
How to use it
The IC describes both what you came from and what you eventually need to recreate as an adult. Stable IC themes — colours, foods, rituals — feed the rest of the chart.
See your IC in your natal chart.