Wordmark (computer hardware)
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In computer hardware, a wordmark is a bit in each memory location on some variable word length computers (e.g., IBM 1401, IBM 1620) used to mark the end of a word. Sometimes the actual bit used as a wordmark on a given machine is not called wordmark, but has a different name (e.g., flag on the IBM 1620, because on this machine it is multipurpose).