What is the symbol I keep seeing on X(Twitter) after the BBN hashtag

[adam.griggs]

I keep...

 

[BOOM!]

 

[WooBackBaby]

 

[adam.griggs]

 

[adam.griggs]

 

[tiffincatfan79]

 

[abhavsar]

 

[JLink]

 

[Ukhoops1_bbn]

 

[Phoenix Stevens]

 

[Ukhoops1_bbn]

 

[rbramblet]

 

[JackPilgrim]

 

[runningunnin.454]

 

[tiffincatfan79]