Hey @KR_ ,
the flame icon is for the Tinder app, the world one for the Facebook notification status, I'm unsure what app is the third one as the icon is a bit blurry so I cannot identify it.
In regards to the dot, that means you have more pending notifications than what is displayed on the notification bar. The reason is that you have set the option to show only the most 3 recent notifications. To disable this open Settings > Notifications > Status bar > then select All Notifications.