This might be worth pasting on page one somewhere if it isn't already, but here's the Rule V Glossary:
HWMNBN: (He who must never be named) The former Cincinnati Red, Philadelphia Phillie and Montreal Expo who was banned for life from the game for betting on baseball while he managed Cincinnati.
TSMOPOAT: Nolan Ryan (the single most overrated pitcher of all-time)
TSMOPPOAT: Cal Ripken, Jr. (the single most overrated position player of all time)
AFTBOAT: Scott Rolen (alleyviper's favorite third baseman of all time...there was a stretch where it seemed like av picked him every season)
The last one is mine, but the others come from josecanuc, our Rule V prediction king emeritus. I don't know for certain, but he had serious health issues, and I think he's no longer with us.
Let me know if I missed any.