Crossword clues for ___ letter. 4 letters:ZETAGreek letterHTTPWeb lettersABBRShortening lettersELEVTopographic-map lettersPHISKey lettersETALJust to name a few in four lettersIBARBeam shaped like a letterVERTLetters on a TV knobEXITRed-letter signRECDLetters on a date-stampESTDStore-window lettersATTNBusiness-env. lettersOPERPhone lettersMAILSend lettersINRICrucifix letters, in some paintingsOPERPhone letters near 0IRASNest-egg lettersUSSROld polit. lettersNASAHigh-flying lettersNASALetters on G-suitsISBNCopyright-page lettersAMOSOz of lettersTGIFFour happy letters?RHOSLetters between pis and sigmasFDICBank guarantor lettersTNUTLetter-shaped hardwareNYNYLetters for ZIP code 10001SPCAPet shelter lettersESPNLetters in sports?SASEIt might contain a letter from the editor: Abbr.OPECFuel cartel's lettersVSOPBrandy label lettersOPECOil cartel lettersRUNEMystic letterEDNAO'Brien of lettersINIT1st letterHUACMcCarthyism lettersRSVPLetters needing replyRENTMoney from a letterPSISPitchfork-shaped lettersSPQRLetters on a centurion's flagSSTSFast fliers' lettersWWJDLetters on a religious braceletKEYSLetter carriers?WABCNYC call lettersSIRSOld letter opener?MSRPCar sticker lettersNCAAMarch Madness lettersFONTLettering choiceETALList-ending letters
