W indicates a part of the sky occupied by the constellation ara.
Cassiopeia is a visible constellation in the northern sky. In winter, it can be seen from early evening. It looks like a distorted "W" or "M". A constellation is a group of letters that form a pattern that resembles animals, mythological figures or objects. Most constellation names date back to ancient times and were named after the patterns the observer saw in the sky.
Some examples of constellations are Orion, Aquarius, Cancer, etc. Ara is a small constellation located in the southern sky. Its name means "altar" in Latin. The constellation represents the altar used by Zeus and the other Greek gods when they swore allegiance before going to war against Cronos and the Titans.
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