TradeSkillMaster

• Destroy
  Sums the value of each item a particular item disenchants/mills/prospects into, multiplied by its probability.
• VendorBuy
  Cost of an item from a vendor.  This data is only populated once you visit a vendor who sells a particular item.
• VendorSell
  Value of an item when sold to a vendor.

Accounting

• AvgBuy
  By default, a standard average of your total purchase costs for an item.  This can be altered to only include the last X purchases, X being the quantity of item you have in inventory.
• AvgSell
  A standard average of your total sales for an item.
• MinBuy
  The lowest purchase cost you have paid for an item.
• MinSell
  The lowest price you have sold an item for.
• MaxBuy
  The highest purchase cost you have paid for an item.
• MaxSell
  The highest price you have sold an item for.

AuctionDB

• DBMarket
  A 14-day weighted average of of the buyouts of all items on the auction house of a realm.  A weighted average means the older the data, the less effect it was on the average.  It recalculates with every data update from Blizzard, currently around every ~1hr for US and ~30min for EU.
• DBMinBuout
  The lowest buyout for an item on a realm as of the most recent data update from Blizzard.  It is updated with every data update from Blizzard.
• DBHistorical
  A standard 60-day average of a realm's DBMarket values for an item.  It is updated daily.
• DBRegionMarketAvg
  Avgerage of an item's DBMarket values for all realms in a region (US/EU).  It is updated dated daily.
• DBRegionHistorical
  Avgerage of an item's DBHistorical values for all realms in a region (US/EU).  It is updated dated daily.
• DBRegionMinBuyoutAvg
  Average of an item's DBMinBuyout values for all realms in a region (US/EU).  It is updated daily.
• DBRegionSaleAvg
  Average of the sale values of an item across a region (US/EU).  The data is too limited to have a realm version.  It is updated daily.
• DBGlobalMarketAvg
  Same as DBRegionMarketAvg, but uses both regions for calculation.  It is updated daily.
• DBGlobalHistorical
  Same as DBRegionHistorcal, but uses both regions for calculation.  It is updated daily.
• DBGlobalMinBuyoutAvg
  Same as DBRegionMinBuyoutAvg, but uses both regions for calculations.  It is updated daily.
• DBGlobalSaleAvg
  Same as DBRegionSaleAvg, but uses both regions for calculations.  It is updated daily.

Crafting

• MatPrice
  This is determined by the formula that is setup in "/tsm -> Crafting".  By default is it is "min(dbmarket, crafting, vendorbuy, convert(dbmarket))".  The min function takes the lowest value from those listed inside it.
• Crafting
  The total of all of the "MatPrices" (see above) to craft an item.  If there are multiple ways to craft an item the cheapest method is chosen.