ML stands for Morning Line. It mean the "line" or predicted odds for the horses in the race. Actual odds are determined by the amount actually bet on each horse. The track handicapper sets the morning line.
A/E is a stat in horse racing. A means Actual whilst E means estimated. Basically this means that you can calculate the value and therefore the value bets. This enables you to identify value lays. To...
It's a type of bet where you can still win if your choices comes in 2nd/3rd/4th depending on the market. The bet is split into 2, half placed on a straight win and half on, say the next 4 places....