On the Bet Signals page, you'll notice that certain signals are highlighted in green, while others are not.
The plays highlighted in green come from a sportsbook with a winning Bet Signal record during the current season. The 'Trigger Units' show how much the Bet Signals from that book are up or down this season, with green text showing winning plays and red text showing losing plays.
You'll also notice that some plays are in bold text. In the example above, the three signals on New Orleans, as well as one on Sacramento, are in bold. This is simply indicating the home team -- New Orleans and Sacramento are playing at home. The non-bold teams in the picture above -- OKC, San Antonio and Golden State -- are on the road.