It depends on the context of your question, however, The Wife of Bath refers to herself as the 'mark' on at least three different occasions during her lengthy 'Tale'. One occurs at Stanza 604;
"He was, I trow, twenty winters old I guess,
And I was forty, if I shall say sooth, truth
But yet I had always a colt's tooth.
Gat-toothed I was, and that became me well:
I had the print of Saint Venus' seal."
In the phrase 'I had the print of Saint Venus' seal', she is saying she has the "mark" of St. Venus; that being gap-toothed and considered quite alluring. During her soliloquy she refers to herself as marked or being the mark of other physical attributes...