<p>Recently, non-relativistic spin splitting in antiferromagnets has attracted growing attention in condensed matter physics. Although many such materials have long been studied, their features were often overlooked due to their appearance away from high-symmetry directions. This review outlines spin splitting across different spin configurations, including collinear, coplanar, and non-coplanar antiferromagnets, and highlights identification rules, characteristic band structure signatures, and emerging functionalities with potential future applications.</p>