Multiple tweets of the whistle

[HokiePaul]

I know this isn't new, but in watching the NCAA tournament, I noticed that the officials almost always blow their whistle multiple times on fouls/violations that result in a turnover. So if its a simple foul on the defense, you get "tweet", but it its a charge or a travel, you get "tweet-tweet, tweet-tweet" or some variation followed by a signal going the other way.

Does anyone know how this started? Is this something that is specifically addressed at the college/pro level in the officials manual, or is this left unwritten at the college/pro level and become a best practice of sorts?

I only see it occasionally at the HS level which makes sense since it directly contradicts what the NFHS manual says.

Personally I like it and wish NFHS would adopt it as a standard, but if NCAA/Pro don't have this as a written standard, I would assume its not going to happen any time soon.