@Linkat,
It certainly depends on where you see the star, I suppose. Here, in (German-speaking) Europe, it's the traditional sign of the brewers and maltsters guilt.
Used to be the sign for the brewery's own pub ("concessionary beer").
(The stra was either a sign for the water and fire ['hexagram'] or a 'risk and safety symbol' (hexagram: fire and demons) or both. A third theory says that it symbols the ingredients of beer (fire, water, air, hops, malt and water - yeast wasn't used in the early days of beer brewing).
Besides that, it is a pure coincidence that this star looks very similar to the
Star of David.
In southern Germany, parts of Austria and Switzerland the star still is THE sign for local pubs (even without breweries).