The restaurant where Don and his team is waiting for one of the robber teams is called "Three14" which is a reference to Pi usually shortened to 3.14
The numbers for this episode are "3 Course meal 1 Restaurant 4 Robbers 1592 Death Squad Murders." The first six digits of pi are 3.141592.
Pi is referenced at least twice, which has the approximate value of 3.14, the number of the episode itself: A. When Charlie meets Mildred in the garden, she's reading a book called "Life of Pi". B. When Charlie explains his idea using the refrigerator example, he counts various kinds of foods, and end his list with a pie (a homophone of Pi).
Pi is a number closely associated with circles--though as Charlie said in a previous episode, it also shows up in other places seemingly at random--and for many centuries mathematicians struggled to accurately calculate its digits. Some of the earliest advancements, after Archimedes, in approximating pi were achieved (separately) by Chinese and Indian mathematicians in the fifth century. The menus Charlie pulls out of his drawer when evaluating past targets to predict future targets are for an Indian restaurant, a pizza restaurant called "Pie Oh My!," and a Chinese/Mandarin restaurant; both the Indian and Chinese menus feature a circle prominently in their cover design. Additionally, it is pizza (sometimes referred to as "pie") that Millie brings to the Eppes house for dinner.
If one wanted to make the connection, the "circle circle tangent" joke Charlie mentions telling "the senator" at the fundraiser could be considered yet another reference to pi, both in the reference to circles, to which pi is closely associated, and even more loosely in a common fractional approximate to pi (22/7) which bears a passing resemblance to the 007 formula on which the joke is based.