When you're creating star systems for Traveller RPG, you may come across codes such as G2V, M2III, O7V, or A3Va. But what do those letters and numbers mean?
These codes tell us what kind of star we're looking at, how hot it is, and where it fits among other stars. Once you learn how to read them, you'll have another way to bring the worlds of your Traveller campaign to life.
Let's start with our own Sun and work our way through the basics.