Zone of confusion
Volume of space above the station where a lack of adequate navigation signal directly above the VOR station causes the needle to deviate.
PHAK Glossary: Z
2 entries, reproduced verbatim from the Glossary of the Pilot’s Handbook of Aeronautical Knowledge, FAA-H-8083-25C (July 2023).
Zulu time
A term used in aviation for coordinated universal time (UTC) which places the entire world on one time standard.
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The Private Pilot Quick-Review Study Guide covers this in the chapters these terms come up in. It is in CFI review and not on sale yet; the guide page has the list for launch notes.
Source. Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Glossary, FAA-H-8083-25C (July 2023), pages G-1 to G-36, reproduced verbatim from the FAA’s PDF (https://www.faa.gov/regulations_policies/handbooks_manuals/aviation/phak; SHA-256 begins 247929cace0ab56b…). The PDF’s line breaks were re-joined into one paragraph per entry; no word was changed. A United States Government work. Check the current handbook before you rely on an entry here.