[Groff] Question on string registers and requests

[andlabs]

Hello. I noticed, that given

.ds U \\s-2UNIX\\s0

in a troff file after -ms, and neither -ms nor that file define a macro .U,
I could do

.U

and it would be replaced with the contents of that string. Is that a feature
of groff? I'd like to clear things up. Thanks.
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