Question!

Guys
Was just reading a report on Air Power in a Pakistani publication
(http://www.defencejournal.com)
It goes on to say that Pakistans ROSE upgraded Mirage 5’s carry
“South African H4 and H2 PGM’s”

Now despite knowing about the extent and sophistication of the Pakistani Mirage upgrades, I have heard little about what weapons these aircraft would use (there were rumours of South African weapons). Does anyone know what a “H2” and “H4” is!?

Thanks in advance!