SO ) ▁International ▁Trade ▁Union ▁Confeder ation ▁( IT UC ) ▁ ▁Inter - Par liament ary ▁Union ▁( IP U ) ▁Islam ic ▁Development ▁Bank ▁( ID B ) ▁Mult il ater al ▁In vest ment ▁Gu arante e ▁Agency ▁( M IG A ) ▁North ▁Atlantic ▁Tre aty ▁Organ ization ▁( N AT O ) ▁N uc lear ▁Energy ▁Agency ▁( NE A ) ▁N uc lear ▁Supp liers ▁Group ▁( NS G ) ▁Organisation ▁of ▁Islam ic ▁Co operation ▁( O IC ) ▁Organisation ▁for ▁Econom ic ▁Co - operation ▁and ▁Development ▁( O E CD ) ▁Organ ization ▁for ▁Security ▁and ▁Co operation ▁in ▁Europe ▁( OS CE ) ▁Organisation ▁for ▁the ▁Pro hib ition ▁of ▁Chem ical ▁We ap ons ▁( OP C W ) ▁Organ ization ▁of ▁American ▁States ▁( O AS ) ▁( ob server ) ▁P erman ent ▁Court ▁of ▁Ar bitr ation ▁( P CA ) ▁S out heast ▁European ▁Cooper ative ▁In iti ative ▁( SE CI ) ▁United ▁Nations ▁( UN ) ▁United ▁Nations ▁Conference ▁on ▁Trade ▁and ▁Development ▁( UN CT AD ) ▁United ▁Nations ▁Edu c ational , ▁Scient ific , ▁and ▁Cultural ▁Organ ization ▁( UN ES CO ) ▁United ▁Nations ▁High ▁Commission er ▁for ▁Ref uge es ▁( UN H CR ) ▁United ▁Nations ▁Indust rial ▁Development ▁Organ ization ▁( UN ID O ) ▁United ▁Nations ▁Inter im ▁Force ▁in ▁Leb anon ▁( UN I FI L ) ▁United ▁Nations ▁Mission ▁in ▁the ▁Sud an ▁( UN M