# ``expocode``
## Properties
:dimensions: N_PROF
:dtype: str32
## Default Attributes
| Attribute | Value |
|-----|-----|
|``whp_name`` | ``EXPOCODE`` |
## Description
The expedition code, assigned by the CCHDO or generated by the user. Used as the unique identifier for the cruise. Usual generation formula is ICES 4 character platform code then the cruise departure date in YYYYMMDD format. The underscore ``_`` character may also be present.
:::{warning}
There is no requirement that the value in EXPOCODE be the same for an entire bottle file or across CTD profiles in a single zip archive. This will often occur when cruises are combined into a single file.
:::