> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/domain-specific-modeling/body-structure/index/naming-convention-for-sep-model.md).

# Naming Convention for SEP Model

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

### 1. FSN must include the word 'structure', 'entire' or 'part' for concepts that are following the SEP model.

For example,

* Liver **structure** (body structure)
* **Entire** liver (body structure)
* Liver **part** (body structure)

### 2. All descriptions for Entire concept must contain the word 'Entire'.

For example,

| FSN                           | PT           | SYN                        |
| ----------------------------- | ------------ | -------------------------- |
| Entire liver (body structure) | Entire liver |                            |
| Entire thumb (body structure) | Entire thumb | Entire first digit of hand |

### 3. The word 'structure' can be omitted for synonyms.

For example,

| FSN                              | PT              | SYN                 | SYN   |
| -------------------------------- | --------------- | ------------------- | ----- |
| Liver structure (body structure) | Liver structure | Liver               |       |
| Thumb structure (body structure) | Thumb structure | First digit of hand | Thumb |

*S* concepts are usually named x structure (body structure) or structure of x (body structure). *E* concepts are usually named entire x (body structure) or x entire (body structure). *P* concepts are usually named x part (body structure) or part of x (body structure).

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