ITOS

(Improved TIROS Operating System) A series of American weather satellites, launched between 1970 and 1976, which followed on from the TIROS series. ITOS-1 was also known as TIROS M but later spacecraft in the series were given NOAA (National Oceanic and Atmospheric Administratio...
Found on http://www.daviddarling.info/encyclopedia/I/ITOS.html

ITOS

acronym: Improved TIROS Operational System
Found on http://cdiac.ornl.gov/pns/acronyms.html#I
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