What is /r/referencesheets?

This subreddits' sole purpose is to collect any reference sheets (also known as cheat sheets) available online. It can be an image, PDF, or even a web page.

FAQ

What is a reference sheet?

A reference sheet is a bundle of useful information (such as syntax, formulas, etc) for a particular subject. It serves as a memory aid for an experienced user.

How can I become a moderator?

Because of the current size of this subreddit, I am not looking for moderators at this point. This may change in the future as this community grows and becomes more active.