The Register has posted a list going around the Internet of words that will trigger Echelon; its veracity is unknown, but here it is anyway (Mad props to Stash for doing all the hardlinks):
Rewson, SAFE, Waihopai, INFOSEC, ASPIC, MI6, Information
Security, SAI, Information Warfare, IW, IS, Privacy,
Information Terrorism, Terrorism Defensive Information, Defense
Information Warfare, Offensive Information, Offensive Information
Warfare, The Artful Dodger, NAIA, SAPM, ASU, ASTS, National
Information Infrastructure, InfoSec, SAO, Reno, Compsec, JICS,
Computer Terrorism, Firewalls, Secure Internet Connections, RSP,
ISS, JDF, Ermes, Passwords, NAAP, DefCon V, RSO, Hackers,
Encryption, ASWS, CUN, CISU, CUSI, M.A.R.E., MARE, UFO,
IFO, Pacini, Angela, Espionage, USDOJ, NSA, CIA, S/Key,
SSL, FBI, Secret Service, USSS, Defcon, Military, White
House, Undercover, NCCS, Mayfly, PGP, SALDV, PEM, resta,
RSA, Perl-RSA, MSNBC, bet, AOL, AOL TOS, CIS, CBOT,
AIMSX, STARLAN, 3B2, BITNET, SAMU, COSMOS, DATTA, Furbys,
E911, FCIC, HTCIA, IACIS, UT/RUS, JANET, ram, JICC,
ReMOB, LEETAC, UTU, VNET, BRLO, SADCC, NSLEP, SACLANTCEN,
FALN, 877, NAVELEXSYSSECENGCEN, BZ, CANSLO, CBNRC, CIDA,
JAVA, rsta, Active X, Compsec 97, RENS, LLC, DERA, JIC,
rip, rb, Wu, RDI, Mavricks, BIOL, Meta-hackers, ^?,
SADT, Steve Case, Tools, RECCEX, Telex, Aldergrove, OTAN,
monarchist, NMIC, NIOG, IDB, MID/KL, NADIS, NMI, SEIDM,
BNC, CNCIS, STEEPLEBUSH, RG, BSS, DDIS, mixmaster, BCCI,
BRGE, Europol, SARL, Military Intelligence, JICA, Scully,
recondo, Flame, Infowar, FRU, Bubba, Freeh, Archives,
ISADC, CISSP, Sundevil, jack, Investigation, JOTS, ISACA,
NCSA, ASVC, spook words, RRF, 1071, Bugs Bunny, Verisign,
Secure, ASIO, Lebed, ICE, NRO, Lexis-Nexis, NSCT, SCIF,
FLiR, JIC, bce, Lacrosse, Flashbangs, HRT, IRA, EODG,
DIA, USCOI, CID, BOP, FINCEN, FLETC, NIJ, ACC, AFSPC,
BMDO, site, SASSTIXS, NAVWAN, NRL, RL, NAVWCWPNS, NSWC,
USAFA, AHPCRC, ARPA, SARD, LABLINK, USACIL, SAPT, USCG,
NRC, ~, O, NSA/CSS, CDC, DOE, SAAM, FMS, HPCC, NTIS,
SEL, USCODE, CISE, SIRC, CIM, ISN, DJC, LLNL, bemd,
SGC, UNCPCJ, CFC, SABENA, DREO, CDA, SADRS, DRA, SHAPE,
bird dog, SACLANT, BECCA, DCJFTF, HALO, SC, TA SAS,
Lander, GSM, T Branch, AST, SAMCOMM, HAHO, FKS, 868,
GCHQ, DITSA, SORT, AMEMB, NSG, HIC, EDI, benelux, SAS,
SBS, SAW, UDT, EODC, GOE, DOE, SAMF, GEO, JRB, 3P-HV,
Masuda, Forte, AT, GIGN, Exon Shell, radint, MB, CQB,
TECS, CONUS, CTU, RCMP, GRU, SASR, GSG-9, 22nd SAS,
GEOS, EADA, SART, BBE, STEP, Echelon, Dictionary, MD2,
MD4, MDA, diwn, 747, ASIC, 777, RDI, 767, MI5, 737,
MI6, 757, Kh-11, EODN, SHS, ^X, Shayet-13, SADMS,
Spetznaz, Recce, 707, CIO, NOCS, Halcon, NSS, Duress,
RAID, Uziel, wojo, Psyops, SASCOM, grom, NSIRL, D-11,
DF, ZARK, SERT, VIP, ARC, S.E.T. Team, NSWG, MP5k,
SATKA, DREC, DEVGRP, DSD, FDM, GRU, LRTS, SIGDEV, NACSI,
MEU/SOC,PSAC, PTT, RFI, ZL31, SIGDASYS, TDM. SUKLO,
Schengen, SUSLO, TELINT, fake, TEXTA. ELF, LF, MF, Mafia,
JASSM, CALCM, TLAM, Wipeout, GII, SIW, MEII, C2W, Burns,
Tomlinson, Ufologico Nazionale, Centro, CICAP, MIR, Belknap,
Tac, rebels, BLU-97 A/B, 007, nowhere.ch, bronze, Rubin,
Arnett, BLU, SIGS, VHF, Recon, peapod, PA598D28, Spall,
dort, 50MZ, 11Emc Choe, SATCOMA, UHF, The Hague, SHF,
ASIO, SASP, WANK, Colonel, domestic disruption, 5ESS,
smuggle, Z-200, 15kg, DUVDEVAN, RFX, nitrate, OIR,
Pretoria, M-14, enigma, Bletchley Park, Clandestine, NSO,
nkvd, argus, afsatcom, CQB, NVD, Counter Terrorism Security,
Enemy of the State, SARA, Rapid Reaction, OFC3IP, Corporate
Security, 192.47.242.7, Baldwin, Wilma, ie.org, cospo.osis.gov,
Police, Dateline, Tyrell, KMI, 1ee, Pod, 9705 Samford Road,
20755-6000, sniper, PPS, ASIS, ASLET, TSCM, Security
Consulting, M-x spook, Z-150T, Steak Knife, High Security,
Security Evaluation, Electronic Surveillance, MI-17, ISR, NSAS,
Counterterrorism, real, spies, IWO, eavesdropping, debugging,
CCSS, interception, COCOT, NACSI, rhost, rhosts, ASO,
SETA, Amherst, Broadside, Capricorn, NAVCM, Gamma, Gorizont,
Guppy, NSS, rita, ISSO, submiss, ASDIC, .tc, 2EME REP,
FID, 7NL SBS, tekka, captain, 226, .45, nonac, .li, Tony
Poe, MJ-12, JASON, Society, Hmong, Majic, evil, zipgun,
tax, bootleg, warez, TRV, ERV, rednoise, mindwar,
nailbomb, VLF, ULF, Paperclip, Chatter, MKULTRA, MKDELTA,
Bluebird, MKNAOMI, White Yankee, MKSEARCH, 355 ML, Adriatic,
Goldman, Ionosphere, Mole, Keyhole, NABS, Kilderkin,
Artichoke, Badger, Emerson, Tzvrif, SDIS, T2S2, STTC, DNR,
NADDIS, NFLIS, CFD, BLU-114/B, quarter, Cornflower, Daisy,
Egret, Iris, JSOTF, Hollyhock, Jasmine, Juile, Vinnell,
B.D.M., Sphinx, Stephanie, Reflection, Spoke, Talent, Trump,
FX, FXR, IMF, POCSAG, rusers, Covert Video, Intiso, r00t,
lock picking, Beyond Hope, LASINT, csystems, .tm, passwd,
2600 Magazine, JUWTF, Competitor, EO, Chan, Pathfinders, SEAL
Team 3, JTF, Nash, ISSAA, B61-11, Alouette, executive, Event
Security, Mace, Cap-Stun, stakeout, ninja, ASIS, ISA, EOD,
Oscor, Tarawa, COSMOS-2224, COSTIND, hit word, hitword,
Hitwords, Regli, VBS, Leuken-Baden, number key, Zimmerwald,
DDPS, GRS, AGT. AMME, ANDVT, Type I, Type II, VFCT, VGPL,
WHCA, WSA, WSP, WWABNCP, ZNI1, FSK, FTS2000, GOSIP,
GOTS, SACS STU-III, PRF, PMSP, PCMT, I&A, JRSC, ITSDN,
Keyer, KG-84C, KWT-46, KWR-46, KY-75, KYV-5, LHR,
PARKHILL, LDMX, LEASAT, SNS, SVN, TACSAT, TRANSEC, DONCAF,
EAM, DSCS, DSNET1, DSNET2, DSNET3, ECCM, EIP, EKMS,
EKMC, DDN, DDP, Merlin, NTT, SL-1, Rolm, TIE,
Tie-fighter, PBX, SLI, NTT, MSCJ, MIT, 69, RIT, Time,
MSEE, Cable & Wireless, CSE, SUW, J2, Embassy, ETA, Porno,
Fax, finks, Fax encryption, white noise, Fernspah, MYK,
GAFE, forcast, import, rain, tiger, buzzer, N9, pink
noise, CRA, M.P.R.I., top secret, Mossberg, 50BMG, Macintosh
Security, Macintosh Internet Security, OC3, Macintosh Firewalls,
Unix Security, VIP Protection, SIG, sweep, Medco, TRD, TDR,
Z, sweeping, SURSAT, 5926, TELINT, Audiotel, Harvard,
1080H, SWS, Asset, Satellite imagery, force,