The character is here:
(copy-paste works for me)
When I try to import such XML - it ends with
XML file contains fatal error 9:PCDATA invalid Char value 27 [ Line: 417 | Column: 17 ] [conf.import.php:190 ? CFrontendApiWrapper->import() ? CApiWrapper->__call() ? CFrontendApiWrapper->callMethod() ? CApiWrapper->callMethod() ? CFrontendApiWrapper->callClientMethod() ? CLocalApiClient->callMethod() ? call_user_func_array() ? CConfiguration->import() ? CConfigurationImport->import() ? CXmlImportReader->read() in /zab/www-dev/2.4/include/classes/import/CConfigurationImport.php:132]
It's possible to insert this character manually, into host name for example, using zabbix frontend (I used Opera12 browser).
I discovered this issue for a "software_full" inventory field which was populated automatically by server.
It was specific description of software/hardware of a linux-based box.
So, it may be stored, exported to XML but cannot be imported later.