大于 (dà yú) means 'greater than' and is the neutral, general-purpose verb for comparing numbers, sizes, or quantities. Its near-synonym 高于 (gāo yú) is narrower — it specifically means 'higher than' in height, level, or rank (price, score, rank). Unlike noun 以上 (yǐ shàng, '…or more') which follows a number, 大于 sits as a verb between two compared items.