One time binding in AngularJS - fanghm/angularjs_notes GitHub Wiki

One-time binding is supported since AngularJS 1.3 to mitigate the performance degradation introduced by digest cycles.

Example:

<p>Hello {{::name}}</p>

Once name becomes defined and contains a value, Angular will unbind it and any Model updates won’t affect the View.

Ref: https://toddmotto.com/angular-one-time-binding-syntax/