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Symbol | Definition |
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≡ | exactly equal |
≈ | approximately equal to |
= | equal to |
digits | indicates that digits repeat infinitely (e.g. 8.294 369 corresponds to 8.294 369 369 369 369 …) |
The butt was a measure of liquid volume equalling two hogsheads. This equated to 108 imperial gallons (490 l) for ale or 126 imperial gallons (570 l) for wine (also known as a pipe).
The gill (pronounced/ˈdʒɪl/) or teacup is a unit of measurement for volume equal to a quarter of a pint. It is no longer in common use, except in regard to the volume of alcoholic spirits measures.
1 imperial gill | ≡ 5 imperial fluid ounces |
≡ 1⁄32 imperial gallon | |
≡ 1⁄4 imperial pint | |
≡ 142.0653125 ml | |
≈ 142 ml | |
≈ 1.2 US gills |