Schema.org Vocabulary › Property: size
https://schema.org/size
A standardized size of a product or creative work, specified either through a simple textual string (for example 'XL', '32Wx34L'), a QuantitativeValue with a unitCode, or a comprehensive and structured [[SizeSpecification]]; in other cases, the [[width]], [[height]], [[depth]] and [[weight]] properties may be more applicable.
Domain: CreativeWork, Product
Range: DefinedTerm, QuantitativeValue, SizeSpecification, Text