The 2X special and 1/2X special modifies the points scored for each word once activated. These specials are active for two passes of the string, and are then reset. Thinking back to math class, these specials are multiplicative, so if you activate a 1/2X and a 2X at the same time, your net is no modifier to your score. You are however, limited to a maximum of 2X scoring, and a minimum of 1/2X scoring.
Tip: If you accidentally activate a 1/2X special, you can activate a 2X special to offset the difference.
What is String Theory? This post is part of a special section on our site to answer just that. Start from the beginning at southwestgecko.com/WhatIsStringTheory!