1 finger means you blocking line, 2 fingers means your blocking angle. It's up to the other player to cover the opposite side your blocking but its important to hang around in the middle of the court until the very last second so you don't give away your defense.
Didn't read the link, but there are more than just line or angle signals. There is "no block" (generally an open hand) and "ball" block (generally a closed fist) as well. Blocking ball means the defender is on their own to read the blocker who is simply going to take the best angle to block the ball rather than trying to direct the hitter towards the defender (this is often used when the other team is throwing up tight sets). There are also ways to signal where the blocker is going to move should he/she decide to pull off the block. Also, some teams have one designated blocker and when that blocker is serving his/her partner will make the call even though they aren't blocking themselves.
Very informative. You'd think they'd comb the beach for errant shellfish before starting the matches though. I could swear it looked like a clam or two may have found there way into some of the players uniforms.
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