Reserved Words

The document provides a comprehensive list of reserved words that cannot be used as names for LEAP branches, fuels, or regions because they are designated for use in expressions. It also outlines technical constraints for branch names, including a length limit of 2 to 50 characters, the requirement to start with an alphabetic character, and a list of permitted special characters.

• LEAP maintains a specific list of reserved words—including mathematical functions, units of measurement, and system indicators—that are prohibited from being used as names for branches, fuels, or regions.
• Branch names in LEAP must be between 2 and 50 characters long, must start with an alphabetic character, and are not case-sensitive.
• Branch names may only consist of alphabetic and numeric characters, or a specific set of allowed symbols: |, &, ~, ", _, ., $, #, [, ], {, and }.

APA

Stockholm Environment Institute (n.d.). Reserved Words. https://leap.sei.org/help24/Expressions/Reserved_Words.htm?agt=index

Chicago

Stockholm Environment Institute. Reserved Words. n.d. https://leap.sei.org/help24/Expressions/Reserved_Words.htm?agt=index.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Reserved Words |url=https://leap.sei.org/help24/Expressions/Reserved_Words.htm?agt=index |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitutendreserved, author = {{Stockholm Environment Institute}}, title = {{Reserved Words}}, institution = {Stockholm Environment Institute}, url = {https://leap.sei.org/help24/Expressions/Reserved_Words.htm?agt=index}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }