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size

A Schema.org Property

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.
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.
Values expected to be one of these types
DefinedTerm
QuantitativeValue
SizeSpecification
Text
Used on these types
CreativeWork
Product

Source

https://github.com/schemaorg/schemaorg/issues/1797