Definitions for "IFD"
Indentation Force Deflection (IFD) is a measurement of foam firmness. Firmness is independent of foam density, although it is often thought that higher density foams are firmer. It is possible to have high-density foams that are soft – or low-density foams that are firm, depending on the IFD specification. IFD specification relates to comfort. It is a measurement of the surface feel of the foam. IFD is measured by indenting (compressing) a foam sample 25 percent of its original height. The amount of force (in pounds) required to indent the foam is its 25 percent IFD measurement. The more force required, the firmer the foam. Flexible foam IFD measurements range from 10 pounds (supersoft) to about 80 pounds (very firm).
Indentation Force Deflection. A measure of the load bearing capacity of flexible polyurethane foam. IFD is generally measured as the force (in pounds) required to compress a 50 square inch circular indentor foot into a 4 inch thick sample, typically 15 inches square or larger, to a stated percentage of the sample's initial height. Common IFD values are generated at 25 and 65 percent of initial height. (Reference Test Method ASTM D3574 ). Note: Previously called "ILD (Indentation Load Deflection)".
An abbreviation for Images forDeletion.
Image File Directory, the directory to tags in TIFF, EXIF and many camera raw formats.
In TIFF format, an Image File Directory, containing all the TIFF tags for one image in the file (there may be more than one).
Keywords:  writer, ifm, reader, smart, interface
Interface Device: the card reader/writer for the chip card. (Also sometimes IFM: Interface Module).
Smart card interface device. Usually smart card terminal or reader/writer to exchange data transmissions with smart card
Intermediate Frequency Discriminator
Keywords:  diagram, flow, information
Information Flow Diagram