I use "Elizabeth [wife of nnnn Thomas SMITH] //" where "nnnn" is the numeric individual ID of the spouse.
Because there may often be more than one Thomas SMITH (as an example) in my tree, the individual ID tells me which of those individuals she is the wife or partner of, and the two slashes in the software that I use, denote that none of the preceding characters are her actual surname, and her maiden name has not been entered.