There is a site called the KPI Library that lists Key Performance Indicators for a range of business areas. It's a community site of sorts so the KPI suggestions largely emanate from users (as far as I can tell).
Recency is defined by the number of days or weeks since the customer has performed the action (purchase, visit, etc.) you are profiling. The more recently a customer has engaged in an action, the more likely they are to repeat the action, especially when encouraged to repeat by some kind of promotional effort.