amb stands for ambiguous

Author: aaronshaf

doc/api/core/operators/amb.md

@@ -1,6 +1,6 @@
 ### `Rx.Observable.amb(...args)` [Ⓢ](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/amb.js "View in source")
 
-Propagates the observable sequence or Promise that reacts first.
+Propagates the observable sequence or Promise that reacts first. "amb" stands for [ambiguous](http://blogs.msdn.com/b/jeffva/archive/2009/11/18/amb-materialize-and-dematerialize.aspx).
 
 #### Arguments
 1. `args` *(Array|arguments)*: Observable sources or Promises competing to react first either as an array or arguments.