<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, TAL, TAO, TAP, TBF, TBK, TCB, TCM, TCO, TCP, TDD, TDF, TDI, TDM, TDR, TEI, TET, TFT, TGA, TIA, TIP, TLA, TLB, TLD, TLI, TLS, TMG, TNC, TNX, TOK, TOP, TOS, TPA, TPF, TPL, TPO, TPS, TPU, TPX, TRO, TRS, TSO, TSP, TSR, TSV, TTD, TTL, TTS, TUB, TUI, TXL, UAN, UAW, UBD, UCB, UCS, UCX, UDF, UDP, UFO, UIL, UIS, UKC, ULP, UMB, UML, UNC, UNI, UPS, URC, URI, URL, URN, USB, USE, USL, USP, USR, UTC, UTF, UTP, VAL, VAN, VAR, VAX, VBA, VCL, VCR, VDL, VDM, VDT, VDU, VEE, VEL, VGA, VGX, VHE, VHS, VIF, VIM, VLB, VLM, VME, VML, VMS, VOS, VPL, VPN, VQF, VRC, VSE, VSF, VSP, VSX, VTC, VTS, VTW, VUE, VUP, VXI, WAM, WAN, WAP, WBS, WCL, WDM, WEB, WFL, WFW, WGL, WMA, WMV, WOM, WPG, WPI, WRT, WSL, WTF, WTH, WWW, XDL, XDR, XGA, XIE, XML, XMM, XMS, XNF, XNS, XON, XPC, XPG, XPL, XRN, XSB, XSI, XSL, XTI, XTP, XUI, XUL, XVT, XXX, YSM, ZAP, ZFC, ZIF, ZIL, ZOG, ZUG (2003-11-10)

Temporal Light Artefacts (TLAs) are undesired effects in the visual perception of a human observer induced by temporal light modulations. Two well-known examples of such unwanted effects are flicker and stroboscopic effect.

A three-letter acronym (TLA), or three-letter abbreviation, is an abbreviation consisting of three letters. These are usually the initial letters of the words of the phrase abbreviated, and are written in capital letters (upper case); three-letter abbreviations such as etc.