The President's daily brief was originally called the PICL "pickle" for president Kennedy
https://jfk.blogs.archives.gov/2022/06/28/newly-digitized-jfk-picls/
The modern PDB is produced by the Director of National Intelligence, but in John F. Kennedy’s era, the briefing was created by the Central Intelligence Agency. Back then, a consolidated daily update was still a pretty new concept – having premiered during President Harry S. Truman’s administration in 1946 – and the CIA tried a few versions before landing on what they called the President’s Intelligence Checklist, or PICL (pronounced “pickle” by White House staff). Though the CIA once considered PICLs too sensitive to declassify, CIA staff and JFK Library archivists reviewed and opened much of the PICL material in our holdings between 2012 and 2019, and we’ve recently completed digitizing and cataloging these records for online public access. We’re excited to share these materials with you!
Central Intelligence Bulletin
Harry Truman was the first U.S. president to receive a daily intelligence digest. At his direction, the Daily Summary began production in February 1946, and continued until February 1951. President Truman was pleased with the product, but a survey group commissioned by the National Security Council in 1949 was critical of the Daily Summary and issued several recommendations to improve it. The new version, called the Current Intelligence Bulletin, began production on 28 February 1951, and this remained the format of the president's daily digest through Dwight Eisenhower's two terms, although it was retitled the Central Intelligence Bulletin in 1958. The Current/Central Intelligence Bulletin grew longer than its predecessor over time with the addition of more items and more analysis, and would eventually contain more graphics as printing technology improved.
https://www.cia.gov/readingroom/