Relative configurations of consecutive, but not necessarily contiguous, constitutionally equivalent carbon atoms that have a symmetrically-constituted connecting group (if any) are designated 'meso' or 'racemo', as appropriate. Examples:
M03856-1.png
(The symbol
M03856-2.png represents a symmetrically-constituted connecting group, such as
–CH2–,
–CH2–CH2–, or
–CR2–CH2–CR2–.)
Source:
Purple Book, 1st ed., p. 37 (http://old.iupac.org/publications/books/author/metanomski.html)