My question is rather symbolic meaning. In p-adic Hodge theorem (https://en.wikipedia.org/wiki/P-adic_Hodge_theory), it has been defined as follows: $$ D_B(V)=(B \otimes_{\mathbb{Q}_p} V)^{G_K}, \ \text{where $B$ is period ring and $G_K$ is Galois group. }$$ What does the symbol $(B \otimes_{\mathbb{Q}_p} V)^{G_K}$ mean?
Does it mean the set of elements of $B \otimes_{\mathbb{Q}_p} V$ fixed by the Galois action of $G_K$?