Inside the Company, by Philip Agee, p. 519
from the book: ...it has the RYBAT indicator for special sensitivity--because it is a proposal for a CIA officer to be named as the U.S. Embassy Olympic attache for the Games in 1968.
"An example of a CIA slugline is 'RYBAT GPFLOOR'. 'RYBAT' is a CIA crypt that meant 'secret'"
This internal CIA description of the 201 file system makes note of the sensitivity of RYBAT-marked documents: "To retain the P&L, RYBAT, or KAPOK sensitivity of a document remaining in a 201 dossier being retired to Central Files, place that document in an envelope sealed with black tape..."
An example of an envelopE marked RYBAT and sealed with black tape (see previous reference)
National Archives: Research Aid: Cryptonyms and Terms in Declassified CIA Files Nazi War Crimes and Japanese Imperial Government Records Disclosure Acts https://www.archives.gov/iwg/declassified-records/rg-263-cia-records/second-release-lexicon.pdf
Cable indicator for sensitivity of information.
Memorandum re Reclassification of Document, 9/12/62: In terms of sensitivity, KAPOK seems to be the highest level, then RYBAT, then EYES ONLY.
6/8/61 dispatch from Chief, KUTUBE/D to Chief of Station, Rome: "The use of the RYBAT slug alone ain't what it used to be."
1/9/69 Memorandm for the Record by CIRA Ray Rocca: "See our IN 66370 from REDACTED. (This is our copy. It is RYBAT, and therefore we can't make a copy.)