It's the React shortcut for Fragment component.

You can write like this :

import React, { Component } from 'react'



class Component extends Component {

  render() {

    return <> <ComponentA/> <ComponentB/> </>

  }

}

Or without the shortcut and import Fragment component

import React, { Component, Fragment } from 'react'



class Component extends Component {

  render() {

    return <Fragment> <ComponentA/> <ComponentB/> </Fragment>

  }

}

You have to know, you can't use any key or prop with the shortcut syntax.

Here's the official documentation

I hope it helps !