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- Y'
- Video: The luma component of the Y'Cb'Cr' or Y'Pb'Pr' color space. Often abbreviated to Y (without the apostrophe).
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- Y-: see Yotto- (Y-).
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- y-: see Yocto- (y-).
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- Yagi Antenna
- Communications: An unidirectional antenna with at least three elements: a reflector, a driven element and at least one director. Also called a Yagi-Uda Array, after Hidetsugu Yagi and Shintaro Uda, who collaborated in developing this antenna type.

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- Yagi-Uda Array: see Yagi Antenna.
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- Y/C Video: see S-video.
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- Y'Cb'Cr'
- Video: The standard digital color space for consumer video, often abbreviated to YCbCr (without the apostrophe).
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- Y-connector
- Cables: A cable splitter, constructed with an input plug or jack on one end and two output plugs or jacks on the other end.
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- yocto- (y-)
- Measurement: SI / Metric unit of decimal measurement, equal to 10-24 or 0.000000000000000000000001.
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- yotta- (Y-)
- Measurement: SI / Metric unit of decimal measurement, equal to 1024 or 1,000,000,000,000,000,000,000,000.
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- Y'Pb'Pr'
- Video: The standard analog color space for consumer video, often abbreviated to YPbPr (without the apostrophe).
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