jargon As of 2003-11-10,
this dictionary gave expansions for 1218 out of the 26^3 = 17576 possible three-letter acronyms. Here's the
grep command used:
egrep '^[A-Z][A-Z][A-Z]$' Dictionary | sort -u
Here they are:
AAC,
AAL,
AAP,
ABC,
ABI,
ABM,
ABP,
ABR,
ACA,
ACE,
ACF,
ACK,
ACL,
ACM,
ACP,
ACT,
ADC,
ADL,
ADM,
ADO,
ADR,
ADS,
ADT,
AED,
AEP,
AES,
AFJ,
AFK,
AFP,
AFS,
AGL,
AGP,
AIA,
AID,
AIR,
AIT,
AIX,
AKC,
AKL,
ALC,
ALF,
ALM,
ALP,
ALU,
AMD,
AMI,
AML,
AMO,
AMP,
AMS,
AND,
ANI,
ANL,
ANR,
ANS,
ANU,
AOL,
AOP,
AOS,
APA,
APC,
APE,
API,
APL,
APM,
APT,
AQL,
ARC,
ARL,
ARM,
ARP,
ARQ,
ART,
ASA,
ASE,
ASF,
ASK,
ASL,
ASM,
ASN,
ASP,
ASR,
AST,
ATA,
ATK,
ATM,
ATS,
ATX,
AUI,
AUP,
AVI,
AVS,
AWE,
AWG,
AWT,
AYT,
BAD,
BAL,
BAP,
BBC,
BBL,
BBS,
BCC,
BCD,
BCL,
BCS,
BDC,
BDL,
BEA,
BEG,
BEL,
BER,
BFI,
BGA,
BGP,
BIP,
BLT,
BMF,
BMP,
BNC,
BNF,
BOF,
BOS,
BPI,
BPR,
BPS,
BQS,
BRB,
BRH,
BRI,
BRS,
BSA,
BSD,
BSI,
BSL,
BSS,
BST,
BTB,
BTS,
BTW,
BWQ,
CAD,
CAE,
CAF,
CAI,
CAL,
CAM,
CAN,
CAP,
CAS,
CAT,
CAV,
CBD,
CBN,
CBR,
CBT,
CBV,
CCD,
CCL,
CCP,
CCR,
CCS,
CDA,
CDC,
CDE,
CDF,
CDL,
CDM,
CDS,
CEN,
CER,
CFD,
CFP,
CGA,
CGI,
CGM,
CHI,
CID,
CIF,
CIL,
CIM,
CIR,
CIS,
CIX,
CJK,
CLI,
CLM,
CLP,
CLR,
CLU,
CLV,
CLX,
CMA,
CMC,
CML,
CMM,
CMP,
CMS,
CMU,
CMZ,
CNC,
CNI,
CNN,
COM,
COS,
CPE,
CPI,
CPL,
CPM,
CPS,
CPU,
CRC,
CRL,
CRM,
CRT,
CSG,
CSL,
CSM,
CSO,
CSP,
CSR,
CSS,
CSU,
CSV,
CTC,
CTI,
CTL,
CTS,
CTY,
CUA,
CUL,
CUT,
CVS,
CWI,
DAA,
DAC,
DAG,
DAS,
DAT,
DAU,
DBA,
DBC,
DBH,
DCA,
DCC,
DCE,
DCG,
DCI,
DCL,
DCP,
DCS,
DCT,
DDB,
DDE,
DDL,
DDM,
DDN,
DDO,
DDP,
DDS,
DDT,
DEA,
DEC,
DED,
DEK,
DER,
DES,
DEX,
DFA,
DFC,
DFD,
DFS,
DFT,
DGL,
DIB,
DID,
DIL,
DIM,
DIN,
DIP,
DLC,
DLE,
DLG,
DLL,
DLM,
DLP,
DLT,
DMA,
DME,
DMI,
DML,
DMM,
DMZ,
DNF,
DNS,
DOA,
DOE,
DOF,
DOL,
DOM,
DOS,
DPB,
DPL,
DPN,
DPP,
DPS,
DRM,
DSA,
DSE,
DSI,
DSL,
DSM,
DSN,
DSP,
DSR,
DSS,
DST,
DSU,
DSW,
DTD,
DTE,
DTP,
DTR,
DTS,
DUA,
DVD,
DVI,
DXF,
EAF,
EAG,
EAI,
ECC,
ECL,
ECM,
ECP,
EDA,
EDF,
EDI,
EDL,
EDM,
EDP,
EDS,
EER,
EFF,
EFL,
EFT,
EGA,
EGP,
EIA,
EJB,
ELF,
ELI,
ELP,
EMA,
EMC,
EML,
EMM,
EMS,
EMX,
ENQ,
ENS,
EOF,
EOL,
EOT,
EOU,
EPL,
EPP,
EPS,
ERA,
ERC,
ERD,
ERP,
ESA,
ESC,
ESD,
ESF,
ESI,
ESL,
ESP,
ESR,
ETB,
ETC,
ETM,
ETX,
EVE,
EXE,
FAC,
FAD,
FAP,
FAQ,
FAT,
FCB,
FCP,
FCS,
FDC,
FDT,
FEA,
FEC,
FEL,
FFP,
FFT,
FGL,
FHS,
FIR,
FIX,
FMQ,
FMS,
FMV,
FNC,
FOD,
FPA,
FPM,
FPU,
FQL,
FRL,
FSB,
FSF,
FSK,
FSL,
FSM,
FSP,
FTP,
FTX,
FUD,
FYA,
FYI,
GAL,
GAN,
GAP,
GAT,
GCC,
GCL,
GCR,
GCT,
GDB,
GDI,
GEA,
GEI,
GEM,
GFR,
GHC,
GIF,
GIN,
GIP,
GIS,
GKS,
GLB,
GLS,
GLU,
GMD,
GMT,
GNN,
GNU,
GOL,
GOM,
GPF,
GPL,
GPM,
GPS,
GPV,
GPX,
GRE,
GRG,
GSI,
GSL,
GSM,
GSS,
GTL,
GUI,
GVL,
GWM,
HAL,
HCF,
HCI,
HCS,
HDA,
HDC,
HDD,
HDF,
HDL,
HDM,
HEP,
HFC,
HID,
HLL,
HMA,
HMP,
HOL,
HPF,
HPL,
HPR,
HSB,
HSC,
HSM,
HSV,
HTH,
HVD,
IAB,
IAD,
IAL,
IAM,
IAP,
IAR,
IAS,
IAW,
IBM,
ICE,
ICI,
ICL,
ICQ,
ICT,
ICW,
IDD,
IDE,
IDF,
IDL,
IEC,
IEF,
IEN,
IFC,
IFF,
IFP,
IFS,
IFX,
IGC,
IGL,
IGP,
IGS,
IGU,
IHS,
IHV,
IIL,
IIR,
IIS,
IIT,
ILF,
IMD,
IML,
IMO,
IMP,
IMR,
IMS,
IOI,
IOS,
IOW,
IPA,
IPC,
IPE,
IPL,
IPS,
IPT,
IPX,
IQL,
IRC,
IRL,
IRM,
IRQ,
ISA,
ISE,
ISF,
ISL,
ISO,
ISP,
IST,
ISV,
ITP,
ITS,
ITU,
IVR,
IVY,
IXC,
IXO,
JAD,
JAZ,
JCL,
JDK,
JES,
JIT,
JMS,
JNI,
JPL,
JRE,
JRL,
JRN,
JSA,
JSP,
JTB,
JTC,
JTS,
JVM,
KAP,
KBS,
KCL,
KEE,
KFX,
KIS,
KLB,
KMS,
KNI,
KRC,
KRL,
KRS,
KSL,
KSR,
KTH,
LAN,
LAP,
LAT,
LAU,
LAX,
LBA,
LBE,
LBL,
LBX,
LCC,
LCD,
LCF,
LCL,
LCP,
LCS,
LDB,
LDL,
LDP,
LDT,
LEC,
LED,
LEO,
LER,
LGN,
LIF,
LIS,
LLC,
LLP,
LML,
LNF,
LOC,
LOL,
LOM,
LOP,
LPC,
LPF,
LPG,
LPI,
LPL,
LPS,
LPT,
LRC,
LRU,
LSA,
LSB,
LSE,
LSL,
LSP,
LSR,
LTL,
LTR,
LUG,
LUN,
LVD,
LWP,
MAC,
MAD,
MAL,
MAN,
MAO,
MAP,
MAS,
MAU,
MBS,
MCA,
MCC,
MCI,
MCL,
MCP,
MCS,
MDF,
MDI,
MDL,
MFC,
MFE,
MFM,
MHS,
MIB,
MIF,
MIG,
MII,
MIS,
MIT,
MIX,
MJS,
MLL,
MMI,
MML,
MMU,
MMX,
MNP,
MOO,
MOS,
MPC,
MPG,
MPI,
MPL,
MPP,
MPV,
MPX,
MQG,
MRI,
MRP,
MRS,
MSB,
MSM,
MSN,
MSS,
MSX,
MTA,
MTS,
MTU,
MUA,
MUD,
MUP,
MVC,
MVS,
MXI,
NAG,
NAK,
NAS,
NAT,
NAU,
NBS,
NBT,
NCD,
NCP,
NCS,
NDL,
NDS,
NEC,
NFA,
NFS,
NFT,
NGL,
NIC,
NIH,
NII,
NIL,
NIS,
NLM,
NLP,
NLS,
NLX,
NMI,
NMU,
NNI,
NOC,
NOL,
NOR,
NOS,
NOT,
NPC,
NPL,
NQS,
NRZ,
NSE,
NSF,
NSI,
NSS,
NTP,
NTU,
NVS,
OAP,
OBE,
OBJ,
OCL,
OCP,
OCR,
OCS,
OCX,
ODA,
ODC,
ODI,
ODP,
ODT,
OEM,
OIC,
OID,
OIL,
OLC,
OLE,
OMA,
OMF,
OMG,
OMR,
OMS,
OMT,
ONC,
OOA,
OOD,
OOF,
OOP,
OPC,
OPS,
ORB,
ORM,
OSA,
OSD,
OSE,
OSF,
OSI,
OSP,
OTI,
OTP,
OTT,
OWL,
PAD,
PAL,
PAM,
PAP,
PAT,
PAW,
PBD,
PBM,
PBX,
PCA,
PCB,
PCF,
PCI,
PCL,
PCM,
PCN,
PCS,
PCU,
PDA,
PDC,
PDF,
PDH,
PDL,
PDM,
PDP,
PDS,
PDU,
PEM,
PER,
PEX,
PFE,
PFL,
PFP,
PGA,
PGP,
PIC,
PID,
PIE,
PIL,
PIM,
PIN,
PIP,
PIT,
PKE,
PKI,
PLC,
PLD,
PLL,
PMC,
PML,
PNG,
PNP,
POC,
POE,
POM,
POP,
POS,
PPC,
PPD,
PPL,
PPM,
PPN,
PPP,
PQS,
PRA,
PRI,
PRL,
PSA,
PSD,
PSF,
PSI,
PSK,
PSL,
PSN,
PSO,
PTF,
PTI,
PTN,
PTT,
PUB,
PVC,
PVM,
QAM,
QBE,
QCA,
QIC,
QMW,
QNX,
QPE,
RAD,
RAL,
RAM,
RAS,
RCC,
RCL,
RCS,
RDF,
RDI,
RDL,
RDS,
REC,
REM,
REP,
REX,
RFC,
RFE,
RFI,
RFP,
RFT,
RGB,
RIP,
RJE,
RKM,
RLE,
RLF,
RLL,
RMI,
RMS,
RNF,
ROM,
RPC,
RPG,
RPI,
RPL,
RPM,
RPN,
RPT,
RRL,
RRS,
RSA,
RSI,
RSL,
RSN,
RSS,
RTF,
RTI,
RTL,
RTM,
RTP,
RTS,
RTT,
RWP,
SAA,
SAC,
SAD,
SAL,
SAM,
SAN,
SAP,
SAR,
SAS,
SBD,
SBM,
SBR,
SCA,
SCC,
SCI,
SCL,
SCM,
SCO,
SDE,
SDF,
SDH,
SDI,
SDK,
SDL,
SDM,
SDP,
SDS,
SEA,
SEC,
SED,
SEE,
SEI,
SEL,
SEM,
SEP,
SET,
SEX,
SFA,
SFL,
SGI,
SHA,
SIA,
SIG,
SIL,
SIP,
SIR,
SKU,
SMB,
SMG,
SMI,
SML,
SMM,
SMP,
SMS,
SMT,
SNA,
SNI,
SNR,
SOH,
SOJ,
SOL,
SOM,
SOS,
SPC,
SPD,
SPE,
SPG,
SPI,
SPL,
SPM,
SPS,
SPX,
SQE,
SQL,
SQR,
SRI,
SRL,
SRP,
SSA,
SSE,
SSI,
SSL,
SSR,
STB,
STD,
STP,
STX,
SUB,
SVC,
SVG,
SVS,
SYN,
TAA,
TAB,
TAC