Does anyone know what is this blue whatsapp symbol (slide on) means?

[Android Central Question]

Can someone please tell me what this symbol means? is this common on all Samsung 8 phones?

 

[SpookDroid]

If you could upload a screenshot that would be helpful. Where are you seeing this? Does it do anything if you slide on it or tap on it? Is it floating or just appears with Whatsapp open?