Need help deciphering hp-28s program

[mbrethen]

I thought I'd try "411 for the HP 28S", labeled a "Directory Assistance System" written by Tom Affinito in 1988. The 'BUILD' command follows:

Code:

BUILD        CREATE A NEW WORKSPACE
            'name'  :
 
    << HOME ->411 DUP O->S "UTIL" + -> n n.s
        << IF VARS n POS THEN "NAME IN USE" 1 DISP BOOP
           ELSE 'WK.LS' DUP EVAL n + SWAP STO
            "<>" + STR-> n STO
            UTIL
            n.s DUP S->N CRDIR STR->
            WORK CRDIR
            << WON >> SWON STO
            {} SU.LS STO
            MAIN
           END
        >>
    >>

I get a "Too Few Arguments" error on "<>", line 4. Does anyone know what the symbol "<>" represents?