What Centered said.
Here, the white chip is offered and explained as a "desire to try our way of life for 24 hours" and sometimes the words surrender chip are used. Usually at the beginning of the chip system, it's offered, then 30/90/6 mo/9 mo/1 yr and anniversaries (each has a different color) and then the white, one last time. The person giving them out usually says something like "And the white chip is being offered again- why? Because it's the most important. (If no takers, usually say it will be at the front of the room if someone wants to get one)"
Personally, I did not want the attention called to me at first, so I waited til 30 days to get my first chip.