isEvenUnimodular

Given a predicate that represents a relationship or action between entities, generate a one-sentence description explaining its meaning.  
# Instructions
Focus on describing the relationship, not the entities themselves. 
# Response Format
Begin the description with \' Indicates...\'

Predicate: isEvenUnimodular

Indicates that a lattice is both even (all vector norms are even integers) and unimodular (has determinant ±1, i.e., is self-dual).