Conventions, Style, and Usage for Clojure Constants?

Question

What are the best practices for defining constants in Clojure in terms of style, conventions, efficiency, etc.

Answer 1

According to the "Practical Clojure" book, it should be named *pi*

Answer 2

From http://dev.clojure.org/display/community/Library+Coding+Standards:

Use earmuffs only for things intended for rebinding. Don't use a special notation for constants; everything is assumed a constant unless specified otherwise.