There is only one DBT template for Latvian: Latvian - Basic.
The default math braille code for this template is Russian math.
To use this template (and its translator) for technical material, the math notation needs to be enclosed in the DBT math style. This markup is added automatically when importing LaTeX files and some other formats.
For the details about the DBT translator used by Latvian: click here.
This language is usually produced in uncontracted braille, which means that words in the text are rendered in braille on a one-for-one basis: one braille character for each inkprint letter. Some inkprint punctuation may require more than one braille character. Indicating upper case, emphasis, or numbers also adds braille characters to the character count. However, the braille contains no abbreviations or contractions.
If you have questions about producing correct braille, please contact a member of the appropriate braille authority.