CATCH-LETTER
Meaning of CATCH-LETTER in English
ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun
: a faint letter written in the margin of a manuscript as a guide for the rubricator in filling in the required initial
Webster's New International English Dictionary.
Новый международный словарь английского языка Webster.
2012