Questions when reviewing code

[Deo.Dy]

Hi,kind guys!
etm_org_logo_pct_lookup.org(+)=etm_campaign_prelist.org
I have a question ,which i have listed above! I dont known the function of "+",help me kind man,please! I am waiting online!

[guelphdad]

nothing to do with mysql. is this from a different database application or some other coding, php or perl for instance?