This little symbol means that there is a planet or planets suitable for man to live on.

He finds a suitable planet to carry out the next stage of his experiment - Earth.

One cannot send out ships on time chance of their finding a suitable planet.

There are a limited number of suitable planets in such clusters.

Perhaps some of them found suitable planets, said Ship, shortly after they had left.

We will head for the nearest solar system and land on a suitable planet.

However, although they found a few suitable planets, they could never agree on a final choice.

The initial plan is to locate and land on a suitable planet in another galaxy.

A planet suitable for human life has been discovered.

The only suitable planets they won't attack are ones already colonized by their species.