What exactly is M.A.R.S?

I'm presuming it's not the planet, as that is normally just written out as: Mars

Martian
Alien
Rectal
Survey

?

PS. Here's what the internets told me Project Odin is:

The Odin Project is a free, open-source, online coding curriculum designed to teach aspiring web developers the skills needed to become full-stack developers, focusing on hands-on project-based learning.

I'm sure we could use some more full-stack developers that focus on hands-on project-based learning.

Good on them! This will make Mike Rowe very happy indeed.
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T.K. Paker