[1] Inland Computer Service (->"IEEE Standard Dictionary")

[2] Institute of Computer Science (->"IEEE Standard Dictionary")

[3] Integrated Communication System (->"IEEE Standard Dictionary")

[4] Integrated Control System (->"IEEE Standard Dictionary")

[5] Inter-Communication System (FFTF Communication System) (->"IEEE Standard Dictionary")

[6] Internal Countermeasures Set (->"IEEE Standard Dictionary")

[7] Interphone Control Station (->"IEEE Standard Dictionary")