What is the proper way to typeset a vector that has a uniform value?

Question

I have an first-rank tensor for acceleration in four dimensions. My first instinct would be to write that out as $A^\alpha$ to show there are four components to the value, but how would you write this if all the components shared the same value? Would you display it as $\boldsymbol{A}$ or just $A$? For example, in just about every textbook, the Geodesic equation is described as:$$0=\Gamma^\alpha_{\mu\nu}U^\mu U^\nu+\frac{dU^\alpha}{d\tau}$$But isn't it more accurate to say:$$0^\alpha=\Gamma^\alpha_{\mu\nu}U^\mu U^\nu+\frac{dU^\alpha}{d\tau}$$So, if the vector contains the same value for each of the components, what is the proper way to typeset it?