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hash map
This term is a technical staple of computer science and software engineering, describing a specific implementation of an associative array. It carries a neutral, functional connotation and is used almost exclusively in professional or academic technical registers. While often used interchangeably with "hash table," a hash map typically refers to the specific object or class implementation in languages like Java.
Because it is a compound noun referring to a specific data structure, it follows standard English countability rules. It is used as a countable noun when referring to individual instances of the structure within a program's memory or different types of implementations across various programming languages.