R.M.T
. In the reign of William III. all child-stealers (comprachios) apprehended were branded with red-hot iron: R (rogue) on the shoulders; M (manslayer) on the right-hand; and T (thief) on the left.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.