Step 1: The "3 by 5" slogan is decoded directly from its figures: treat 3 million, by the year 2005.
Step 2: It was a joint WHO and UNAIDS target announced in December 2003 to scale up antiretroviral therapy to 3 million HIV-positive people in low and middle income countries by end of 2005, as a stepping stone toward universal ART access.
Step 3: The strategy rested on five pillars including simplified ART tools, a reliable medicine supply service, knowledge dissemination, sustained country support, and global leadership. The distractor ratios and percentages do not match this definition.
\[\boxed{\text{Providing 3 million people treatment by the end of 2005}}\]