SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati 2CXO J155657.4+353057

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [X]          2CXO (Second release of the Chandra Source Catalog) =E=
                                                         2CXO JHHMMSS.s+DDMMSS{|X}
=E= indicates catalogues available in electronic form at CDS