Designed to be mounted in a standardized rack system, typically referring to computer servers, networking equipment, or audio gear. Equipment that fits standard 19-inch rack units.
Compound of 'rack' (from Middle Dutch 'rec' meaning framework) and 'mount' (from Latin 'mons' meaning mountain, later meaning 'to place on'). The standardized 19-inch rack system was developed by Bell System in the early 20th century for telephone equipment.
The 19-inch standard is so ubiquitous that it's shaped the entire computer industry - servers, switches, and storage devices worldwide conform to this century-old telephone company specification. This standardization is why data centers look so orderly and why equipment from different manufacturers fits together perfectly.
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