The meaning of the Acronym GISS is...

GISS is

• Goddard Institute For Space Science
• General Impression Size And Shape
• Generic Internet Service Specification

More Meanings For GISS:

• General Impression of Size and Shape
• Goddard Institute for Space Studies
• Goddard Institute For Space Science
• General Impression Size And Shape
• Generic Internet Service Specification

GISS is also in:

• Mathematics
• Ocean Science
• Unfiled