described at URL

http://www.wikidata.org/prop/direct/P973

Used as a Predicate in:

Schema Name	Schema Link
space probe	https://www.wikidata.org/wiki/EntitySchema:E119
one-of-a-kind computer	https://www.wikidata.org/wiki/EntitySchema:E129
UNESCO world heritage site	https://www.wikidata.org/wiki/EntitySchema:E142
file system	https://www.wikidata.org/wiki/EntitySchema:E145
strain	https://www.wikidata.org/wiki/EntitySchema:E174
API endpoint	https://www.wikidata.org/wiki/EntitySchema:E209
HTML element	https://www.wikidata.org/wiki/EntitySchema:E217
statue	https://www.wikidata.org/wiki/EntitySchema:E99

Used as an Object in:

Schema Name	Schema Link
space probe	https://www.wikidata.org/wiki/EntitySchema:E119
one-of-a-kind computer	https://www.wikidata.org/wiki/EntitySchema:E129
UNESCO world heritage site	https://www.wikidata.org/wiki/EntitySchema:E142
strain	https://www.wikidata.org/wiki/EntitySchema:E174
API endpoint	https://www.wikidata.org/wiki/EntitySchema:E209
HTML element	https://www.wikidata.org/wiki/EntitySchema:E217
statue	https://www.wikidata.org/wiki/EntitySchema:E99