| Rank | Abbreviation | Meaning |
|---|
| ***** | ISCN | International System For Human Cytogenetic Nomenclature
| |
| ***** | ISCN | International System for Chromosome Nomenclature
| |
| **** | ISCN | International Standard for Cytogenetic Nomenclature
| |
| *** | ISCN | International System for Human Cytogenic Nomenclature
| |
| *** | ISCN | International System for Cytogenetic Nomenclature
| |
| *** | ISCN | Insane Spanish Cobra Nation
| |
| ** | ISCN | Interface Specification Change Notice
| |
| ** | ISCN | Infant Special Care Nursery
| |
| ** | ISCN | Integrated Support Center for Nuclear Nonproliferation and Nuclear Security
| |
| * | ISCN | Information System Change Notice
| |
| * | ISCN | It Sport Calcio Napoli
| |
| * | ISCN | International Symposium on Computer Networks
| |
| * | ISCN | Inhomogeneous Symmetrical Condensed Node
| |
| * | ISCN | Internet Systems Consortium NOC
| |
| * | ISCN | Irish Setter Club of the Netherlands
| |
| * | ISCN | International Sustainable Campus Network
| |
| * | ISCN | International Shared Cost Number
| |
| * | ISCN | Integrated Specialty Care Networks
| |
| * | ISCN | Interstaff Secure Communication Network
| |
| * | ISCN | International Society of Citrus Nurserymen
| |
| * | ISCN | International Symposium on Cognitive Neuroscience
| |
| * | ISCN | Iranian Stem Cell Network
| |
| * | ISCN | Intentional Satellite Clock Noise
| |
| * | ISCN | International Software Consulting Network
| |
| * | ISCN | Illinois Storage Certificate Number
| |