track and hold unit; track and store unit
Technical computing term for a circuit that captures and holds an analog signal value. Used in contexts such as analog-to-digital conversion and signal processing.
A track and hold unit is a circuit that holds an analog signal for a fixed period.
Compound of 追従 (tracking) + 保持 (holding) + 要素 (element). The exact derivation is uncertain; the term is a technical calque from English 'track and hold unit'.