# Identifiers

This section describes the identifier conventions used by Intel® Threading Building Blocks.

## Case

The identifier convention in the library follows the style in the ISO C++ standard library. Identifiers are written in underscore_style, and concepts in PascalCase.

## Reserved Identifier Prefixes

The library reserves the prefix `__TBB` for internal identifiers and macros that should never be directly referenced by your code.

Parent topic: General Conventions