In Adaptive Server 15.7 and later, you can use quoted identifiers for tables, views, column names, index names, and system procedure parameters.
In versions earlier than 15.7, Adaptive Server treated “ident” as an identifier that used nonalphanumeric characters delimited with double quotes (quoted identifiers) or square brackets. These identifiers could be used only for table, view, and column names.
See the Reference Manual: Blocks.