It's the abbreviation for Mean Corpuscular Hemoglobin. This is a measure for how much hemoglobin per red blood cell count. MCH stands for Mean Corpuscular Hemoglobin. It is a measure of the average amount of hemoglobin in each red blood cell. 9 people found this useful.
Human Interface Device (HID) Definition - What does Human Interface Device (HID) mean? A human interface device (HID) is a method by which a human interacts with an electronic information system either by inputting data or providing output. A myriad of HID devices exist. The most common are the keyboards, mice, computer speakers, webcams and headsets.
The USB specification includes a specification for two particular Human Interface Devices (HIDs) - mouse and keyboard. All modern BIOSes and all current operating systems will work with these devices. So if a mouse is HID compliant, it will work with just about any computer running just about any OS out of the box without needing to load special drivers.