SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati IC 2504

.

 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [?]          I (Roman num. list I)  . . . . . . . . =E= IC NNNN
 [Infrared(NAME HDFN)] IC (Imperial College) . . . . . . [GOS97] JHHMMSS.s+DDMMSS
 [?]          IC (Index Catalog) . . . . . . . . . . =E= IC NNNN
 [?]          IC I (Index Cat. list I) . . . . . . . =E= IC NNNN
 [?]          IC II (Index Cat. list II) . . . . . . =E= IC NNNN
 [?]          II (Roman num. list II)  . . . . . . . =E= IC NNNN
 [*inCl]      Cl* AM 4 IC (Inman+Carney) . . . . . . . . Cl* AM 4 IC A
                                                      or Cl* AM 4 IC {A}-NNN
                                                      or Cl* AM 4 IC {B}-NN
                                                      or Cl* AM 4 IC {C}-NN
=E= indicates catalogues available in electronic form at CDS