Based on the standard curriculum for (typically Introduction to Data Structures at UC San Diego or equivalent courses), the "maps list" usually refers to the topics covered under the Map (Dictionary/Associative Array) abstract data type.

The CS:GO 15 maps list refers to the collection of 15 maps that are officially recognized by Valve Corporation, the game's developer, as part of the competitive map pool. These maps are:

The CS 1.5 community was famous for "fun" maps that didn't follow official mission types. Counter-Strike Maps - Liquipedia

: Set in dark city alleys and industrial spaces.

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: Set in an industrial site, this was one of the earliest hostage rescue maps. Popular Custom Map Types

: Type CS15 into the SAP command field.