What are the icon with four stripes next to kill, assist and revive icon?

Hello, I have been googling this a bit, but can't find an answer to what are the icon with four lines next to kill, assist and revive icon in the squad score screen? It's a pretty small issue compared to everything else, but it's annoying not knowing what it's for...

See the screenshot if you are unsure what I mean. The four lines right of revive symbol.