9×21mm
9×21mm is a pistol cartridge or ammunition model.
Also recorded as 9×21mm IMI; 9 x 21mm; 9 mm IMI.
In detail
It is associated with Israel. The record gives 1984 as its date of establishment or first appearance.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“9×21mm”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q649326: 9×21mm
Consult the source