| A&E | Arts and Entertainment |
| AA | Attempted Abortion |
| AAC | Advanced Ability Center |
| ABC | American Broadcasting Company |
| Abil. | Ability (magazine) |
| ABLE | Association for Better Living and Education |
| abbrev. | abbreviation |
| ACC | Advanced Clinical Course |
| Ack | acknowledgement |
| ACLU | American Civil Liberties Union |
| ACT, a.c.t. | alt.clearing.technology (news group) |
| AD, A.D. | After Dianetics; Year of our Lord (Latin: Anno Domini) |
| Admin | administration |
| AFAIK | as far as I know |
| AFF | American Family Foundation |
| AG | Assistant Guardian; Attorney General |
| AMA | American Medical Association |
| ANC | African National Congress |
| ANZO | Australia, New Zealand, Oceania |
| AO | Advanced Organization |
| AOL | America On Line |
| AOLA | Advanced Organization, Los Angeles |
| AOSHANZO | Advanced Organization, Saint Hill, Australia/New Zealand/Oceania |
| AOSHDK | Advanced Organization, Saint Hill, Denmark |
| AOSHEU | Advanced Organization, Saint Hill, Europe |
| AOSHUK | Advanced Organization, Saint Hill, United Kingdom |
| AP | Aberrated Personality |
| APA | American Psychiatric Association; American Psychological Association |
| apt. | apartment |
| ARC | Affinity, Reality, Communication |
| AZ, Ariz. | Arizona |
| ARS, a.r.s. | alt.religion.scientology (news group) |
| ARSCC | alt.religion.scientology Central Committee |
| ARSCC(wdne) | alt.religion.scientology Central Committee (we do not exist) |
| ASCII | American Standard Code for Information Interchange |
| ASF | Astounding Science Fiction |
| ASHO | American Saint Hill Organization |
| ASHOD | American Saint Hill Organization Day |
| ASHOF | American Saint Hill Organization Foundation |
| ASI | Author Services, Inc. |
| AU | Americans United (for the Separation of Church and State) |
| AVC | Authorization, Verification and Correction |
| Ave. | Avenue |
| AVU | Authorization, Verification and Correction Unit |
| CA, Calif. | California |
| CAN | Cult Awareness Network |
| CC | Celebrity Centre |
| CCC | Canadian Criminal Cases |
| CCHR | Citizens Commission on Human Rights |
| CC Int. | Celebrity Centre International |
| CCLV | Celebrity Centre Las Vegas |
| CCO | Child Care Organization |
| CCRD | Clear Certainty Rundown |
| CD | compact disc |
| cd | could |
| CDEI | Curiosity, Desire, Enforce, Inhibit |
| CDU | Christian Democratic Union |
| CE | Civil Engineer |
| CEO | Chief Executive Officer; Cadet Estates Organization |
| CESO | Cedars Estate Service Organization |
| CF | Central Files |
| CHP | California Highway Patrol |
| CI | Counter-Intention |
| CIA | Central Intelligence Agency |
| CLO | Continental Liaison Office |
| CMO | Commodore's Messenger Organization |
| CMO INT | Commodore's Messenger Organization International |
| CMO IXU | Commodore's Messenger Organization Internal eXtension Unit |
| CO | Commanding Officer; Company |
| COB RTC | Chairman of the Board, Religious Technology Center |
| comm | communication |
| Comm Ev | Committee of Evidence |
| CoS, CofS, Co$ | Church of Scientology |
| COSRECI | Church of Scientology Religious Education College International |
| CPLO | Continental Publications Liaison Office |
| CPO | Central Personnel Office/Officer; Chief Petty Officer |
| C/S | Case Supervisor; Course Supervisor |
| CSC | Church of Scientology of California |
| CSFSO | Church of Scientology Flag Service Organization |
| CSG | Commodore's Staff Guardian |
| CSI | Church of Scientology International |
| CSS | Cascading Style Sheet |
| CST | Church of Spiritual Technology |
| CSW | Completed Staff Work |
| CT | Conditional Target |
| D | Democrat |
| DA | Dead Agent; District Attorney |
| DAG | Deputy Assistant Guardian |
| DB | Degraded Being |
| dba | Doing Business As |
| DC | District of Columbia |
| DCI | Dianetic Centers International |
| DCSI | Dianetic Clear Special Intensive |
| DE | Dennis Erlich |
| DEA | Drug Enforcement Agency |
| depo. | deposition |
| dept. | department |
| Dev-T | Developed Traffic |
| DFGB | Dianetic Federation of Great Britain |
| DFI | Dianetics Foundation International |
| DG | Deputy Guardian |
| DGI | Deputy Guardian (International?) |
| Dir. | Director; Directorate(?) |
| Div. | Division |
| DM | David Miscavige; Deutsch Mark |
| DMCA | Digital Millennium Copyright Act |
| DMSMH | Dianetics: The Modern Science of Mental Health |
| Dn | Dianetics |
| DSA | Deputy of Special Affairs |
| DVD | digital versatile disc |
| FAA | Federal Aviation Administration |
| FACTNet | Fight Against Coercive Tactics Network |
| FAF | Friends of the Animals Foundation |
| FAQ | frequently asked questions |
| FB | Flag Bureaux |
| FBI | Federal Bureau of Investigation |
| FBO | Flag Banking Officer |
| FCB | Flag Command Bureaux |
| FDA | Food and Drug Administration |
| FDN | Foundation |
| FDSing | False Data Stripping |
| Feb | February |
| FEBC | Flag Executive Briefing Course |
| FIV | feline immunodeficiency virus |
| FL, Fla. | Florida |
| FLB | Flag Land Base |
| F/N | Floating Needle |
| FO | Flag Order |
| FOI | Freedom of Information |
| FOIA | Freedom of Information Act |
| FOLO | Flag Operations Liaison Office |
| FPRD | False Purpose Rundown |
| F/R | Flag Representative |
| fran. | franchise |
| Fri. | Friday |
| FSM | Field Staff Member |
| FSO | Flag Service/Ship Organization |
| FSSO | Flag Ship Service Organization |
| FTC | Federal Trade Commission |
| FZ | Free Zone |
| HAS | Hubbard Association of Scientologists; Hubbard Apprentice Scientologist; Hubbard Area Secretary |
| HASI | Hubbard Association of Scientologists International |
| HCA | Hubbard College of Administration |
| HCO | Hubbard Communications Office |
| HCOB | Hubbard Communications Office Bulletin |
| HCOPL | Hubbard Communications Office Policy Letter |
| HDF | Hubbard Dianetics Foundations |
| HDRF | Hubbard Dianetics Research Foundation |
| HES | HCO Executive Secretary |
| HFA | Held From Above |
| HGB | Hollywood Guaranty Building |
| HGC | Hubbard Guidance Center |
| HIV | human immunodeficiency virus |
| hldrs. | holders |
| H.M. | His/Her Majesty |
| HoM | History of Man |
| Hon. | Honorable |
| HQS | Hubbard Qualified Scientologist |
| HRA | Human Rights Act |
| HSF | Hanns-Seidel Foundation |
| HTML | HyperText Markup Language |
| HTTP | HyperText Transport Protocol |
| IAS | International Association of Scientologists |
| I/C | In Charge |
| ID | identity |
| i.e. | that is (Latin: id est) |
| IE | Internet Explorer |
| IEmac | Internet Explorer for Macintosh |
| IEwin | Internet Explorer for Windows |
| IFP | Inkatha Freedom Party |
| IHELP | International Hubbard Ecclesiastical League of Pastors |
| IL | Illinois |
| IMO | International Management Organization |
| Inc. | Incorporated |
| INCOMM | International Network of Computer Organized Management |
| info | Information |
| INT | International |
| intell | intelligence |
| Int'l | International |
| IOW | in other words |
| IP | internet protocol; Interpol(?) |
| IQ | intelligence quotient |
| IRC | internet relay chat |
| IRL | in real life |
| IRS | Internal Revenue Service (US tax agency) |
| ISP | Internet Service Provider |
| ITO | International Training Organization |
| PAB | Professional Auditor's Bulletin |
| PAC | Pacific Area Command |
| para(s). | paragraph(s) |
| PC | Pre-Clear; politically correct |
| PDC | Philadelphia Doctorate Course |
| PE | Personal Efficiency (course) |
| PES | Public Executive Secretary |
| ph | phonetic |
| Ph.D. | doctor of philosophy (Latin: Philosophiae Doctor) |
| PI | private investigator |
| P/L | Policy Letter |
| POB | post office box |
| PPRO Res. | Personal Public Relations Officer Researcher |
| PR | public relations |
| PRA | Public Relations Area |
| PRAWW | Public Relations Area World Wide |
| PRO | Public Relations Office/Officer |
| PROAC | Public Relations Office/Officer Area Control |
| PRO TR(s) | Professional Training Routine(s) |
| PT | Present Time |
| PTA | Parent-Teacher Association |
| PTS | Potential Trouble Source |
| PTS/SP | Potential Trouble Source/Suppressive Person |
| pubs. | publications |
| Purif | Purification Rundown |
| S. | south |
| SA | South Africa |
| Sat. | Saturday |
| SC | Scientology Church |
| Scien, Scieno | Scientologist/Scientology |
| Scn | Scientology |
| Scnist | Scientologist |
| Sec | Security; secretary |
| Sec Check | Security Check |
| Seced | Secretarial Executive Directive |
| Ser Fac | Service Facsimile |
| SF, s-f, sci-fi | science fiction |
| SFO | San Francisco Org(anization)[?] |
| SH | Saint Hill |
| shd | should |
| SHSBC | Saint Hill Special Briefing Course |
| SM | Smith Mitchell |
| SMI | Scientology Missions International |
| SO | Sea Org(anization); Scientology Organization |
| SOB | son of a bitch |
| SOR | Sea Org(anization) Reserves |
| SOS | Science of Survival |
| SP | Suppressive Person |
| SRA | Severe Reality Adjustment |
| SS | defense squadron (German: Schutzstaffel) |
| SS#, SSN | Social Security Number |
| stats | Statistics |
| STN | Stahlbautechnik Neckar |
| Sun. | Sunday |
| SZ | Sueddeutsche Zeitung |