All these symbols such as {}, [], [] and [()] are used to express data, event binding, templating concerns and property binding. {} is used for interpolation
[] is used of property binding
[()] is used for event binding

Use of {} symbol

import {Component} from 'Angular2/core';
@Component({
selector: 'cars-app',
template: `
<h1>BMW</h1>
<h2>Total {{ totalCars }}</h2>
` }) export class CarsApp {
totalCars: number = 985;
}

use of [] symbol

Through special attributes on HTML elements, Every DOM property can be written.

Use of [()] symbol

The common syntax of event binding attribute is— ([Name of DOM event]) =”[Template expression]”

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