Inhibit Switch C Bit (SAUS)
Interallied Staff Communications Board - World War II
International Society for Cell Biology - Later, IFCB (ASF)
International Society for Classical Bibliography - Paris, France (EAIO)
International Society for Clinical Biostatistics (EAIO)
International Society for/of Cell Biology (SAUO)
International Society of Cardiology Bulletin - Medicine (EDAA)
Isabella Shipping Company - Common carrier symbol