Email variables

I am trying to learn all of the variables that WooCommerce can use in its emails. The emails are in the WooCommerce->Settings->Emails tab. If I click on the gear icon on the right hand side of the page, corresponding to a particular email, a new page loads. This page lets you set the Recipient, Subject, Email Heading, and Email type. In these fields, there are 3 variables that I have found so far:
{site_title}
{order_number}
{order_date}
But, I cannot find any documentation on these variables, or if there are more variables than these three. Is there any documentation about these variables that can be used in WooCommerce emails?

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