Template
document template
It is called a Template
FIELD
That is basically the description of a template.Note that a template need not contain both of these; it might ONLY have formatting (for example, style definitions, that describe how to format commonly used styles, such as headings, etc.), or it may ONLY contain placeholder texts, to help you quickly write documents you need frequently. Of course, it may also contain both. A template may also contain additional things, such as macros.
Such a document is called a template
The placeholder in the main document to be replaced with data in a data source is typically referred to as a "mail merge field." This field acts as a marker for where the specific data from the data source will be inserted during the merging process.
A box in a template that acts as a placeholder is called a placeholder or a placeholder box. It is used to indicate where content or elements can be inserted into the template.
Table of figures
controlTemplateA templateIt
base document
The term for a placeholder made up of small boxes called cells is a grid.
Formatted pieces of content stored in galleries is called the Building Block.