incomprehensible abbreviation on German binoculars WW1

[samland]

This abbreviation is on the Carl Zeiss binoculars - 2.J.R.P.3.5 или 2.I.R.P.3.5

What does it mean ? Jaeger regiment pionier или Infanterie regiment pionier ? Or is it something else?

THANKS !

[kekel]

Kaiserliche Tirolisch-Jägerregiment Nr. 2.infantry regimented but I may be wrong

[habicht]

2nd Grenadier Regiment(Pommersches), 3rd Company, Item # 5.

[kekel]

hi habitch , I thought it might be too Jäger-Regiment zu Pferde Nr. 2

[Watchdog]

2nd Grenadier Regiment(Pommersches), 3rd Company, Item # 3.

Makes sense to me but what is the smaller .5 at the end?

Regards

Mark

[habicht]

Sorry Mark. I meant to write item #5. I've since corrected my post.