The term 'code block' is also used as part of the grammar of the language in The Swift Programming Language and used in various places throughout the text:
Code Blocks
A code block is used by a variety of declarations and control structures to group statements together. It has the following form:
{ <#statements#> }The statements inside a code block include declarations, expressions, and other kinds of statements and are executed in order of their appearance in source code.
Grammar of a code block
code-block →
{statements ?}