diplen.

/ˈdɪpliː/Etymology: < Greek διπλῆ, feminine of διπλοῦς double (sc. γραμμή stroke, line).
1656 T. Blount Diple, a note or mark in the Margent to signifie that there is somewhat to be amended.
This entry has not yet been fully updated (first published 1896; most recently modified version published online January 2018).