What is this symbol?

Hi all. Sorry if this is a silly question but what is the pictured symbol? It only shows when I’m in the shop but is is not any of the currencies. Iv looked and it does not seem to be for any packs either any ideas?

Hi all. Sorry if this is a silly question but what is the pictured symbol? It only shows when I’m in the shop but is is not any of the currencies. Iv looked and it does not seem to be for any packs either any ideas?