*Y

Here’s a list of Instrumentation abbreviations starting with the letter “Y”, commonly used in P&IDs, datasheets, control systems, and field instrumentation.

Y: Yard / Yield / Yoke / Auxiliary (context dependent)
YA: Yard Alarm / Yield Alarm / Yoke Alarm
YAC: Yard Alarm Controller / Yield Alarm Controller / Yoke Alarm Controller
YAM: Yard Alarm Module / Yield Alarm Module / Yoke Alarm Module
YB: Yard Bus / Yield Bus / Yoke Bus
YBC: Yard Bus Controller / Yield Bus Controller / Yoke Bus Controller
YC: Yard Controller / Yield Controller / Yoke Controller
YCA: Yard Control Assembly / Yield Control Assembly / Yoke Control Assembly
YCC: Yard Control Cabinet / Yield Control Cabinet / Yoke Control Cabinet
YCD: Yard Control Device / Yield Control Device / Yoke Control Device
YCM: Yard Control Module / Yield Control Module / Yoke Control Module
YCP: Yard Control Panel / Yield Control Panel / Yoke Control Panel
YCS: Yard Control System / Yield Control System / Yoke Control System
YD: Yard Device / Yield Device / Yoke Device
YDC: Yard Device Controller / Yield Device Controller / Yoke Device Controller
YDD: Yard Detection Device / Yield Detection Device / Yoke Detection Device
YE: Yard Element / Yield Element / Yoke Element
YF: Yard Flow / Yield Flow / Yoke Flow
YFC: Yard Flow Controller / Yield Flow Controller / Yoke Flow Controller
YFD: Yard Flow Device / Yield Flow Device / Yoke Flow Device
YFM: Yard Flow Meter / Yield Flow Meter / Yoke Flow Meter
YG: Yard Gauge / Yield Gauge / Yoke Gauge
YH: Yard High / Yield High / Yoke High
YI: Yard Indicator / Yield Indicator / Yoke Indicator
YIC: Yard Indicating Controller / Yield Indicating Controller / Yoke Indicating Controller
YIM: Yard Interface Module / Yield Interface Module / Yoke Interface Module
YL: Yard Low / Yield Low / Yoke Low
YLA: Yard Low Alarm / Yield Low Alarm / Yoke Low Alarm
YLC: Yard Low Controller / Yield Low Controller / Yoke Low Controller
YLD: Yard Low Device / Yield Low Device / Yoke Low Device
YLI: Yard Low Indicator / Yield Low Indicator / Yoke Low Indicator
YLT: Yard Low Transmitter / Yield Low Transmitter / Yoke Low Transmitter
YM: Yard Module / Yield Module / Yoke Module
YMC: Yard Module Controller / Yield Module Controller / Yoke Module Controller
YN: Yard Node / Yield Node / Yoke Node
YO: Yard Output / Yield Output / Yoke Output
YOC: Yard Output Controller / Yield Output Controller / Yoke Output Controller
YOM: Yard Output Module / Yield Output Module / Yoke Output Module
YP: Yard Point / Yield Point / Yoke Point
YPC: Yard Point Controller / Yield Point Controller / Yoke Point Controller
YPD: Yard Pressure Device / Yield Pressure Device / Yoke Pressure Device
YPI: Yard Pressure Indicator / Yield Pressure Indicator / Yoke Pressure Indicator
YPT: Yard Pressure Transmitter / Yield Pressure Transmitter / Yoke Pressure Transmitter
YR: Yard Recorder / Yield Relay / Yoke Relay
YRC: Yard Recorder Controller / Yield Relay Controller / Yoke Relay Controller
YRD: Yard Relay Device / Yield Relay Device / Yoke Relay Device
YS: Yard Switch / Yield Switch / Yoke Switch
YSC: Yard Switch Controller / Yield Switch Controller / Yoke Switch Controller
YSD: Yard Shutdown Device / Yield Shutdown Device / Yoke Shutdown Device
YSI: Yard Status Indicator / Yield Status Indicator / Yoke Status Indicator
YSM: Yard Signal Module / Yield Signal Module / Yoke Signal Module
YT: Yard Transmitter / Yield Transmitter / Yoke Transmitter
YTC: Yard Temperature Controller / Yield Temperature Controller / Yoke Temperature Controller
YTD: Yard Trip Device / Yield Trip Device / Yoke Trip Device
YTI: Yard Temperature Indicator / Yield Temperature Indicator / Yoke Temperature Indicator
YTT: Yard Temperature Transmitter / Yield Temperature Transmitter / Yoke Temperature Transmitter
YV: Yard Valve / Yield Valve / Yoke Valve
YVC: Yard Valve Controller / Yield Valve Controller / Yoke Valve Controller
YVM: Yard Valve Module / Yield Valve Module / Yoke Valve Module