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glass instrument for measuring time, usually consisting of two bulbs united by a narrow neck. One bulb is filled with fine sand that runs through the neck into the other bulb in an hour's time. The date of its invention is unknown, but it was in use in ancient times. Similar devices for marking shorter periods of time, e.g., three-minute sandglasses for timing the cooking of eggs, are still used occasionally.
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What does it mean when you dream about an hourglass?

An hourglass represents the passing of time and the end of a cycle in one’s life or a project.

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An instrument for measuring time, consisting of two somewhat funnel-shaped vessels joined at their narrow points by a thin, hollow neck; one hour is required for a given quantity of sand to fall from the upper to the lower vessel.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


An icon that is commonly used on graphical interfaces to mean "wait until finished." When the hourglass icon appears, you cannot do anything within that part of the application until that task has completed and the hourglass goes away.

An hourglass is a centuries-old device for counting time. It consists of two glass chambers attached to each other via a tiny opening. Half filled with sand, when the hourglass is turned over, the sand falls from one chamber to the other. The amount of sand and size of chambers and opening are precisely measured so that when all the sand from one side falls to the other, a certain amount of time has passed. See hourglassing.
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Dr Hassan Abbas of Hourglass Aesthetics teaching during a training course
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Very atmospheric with a cast of colourful characters, The Hourglass Factory is a rollicking read with excellent historical detail that has a strong sense of theatre.
Figure 1(a) shows an example of the hourglass array.
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Seventy-five grim, Third Reich things: toys, a bust relief of Adolf Hitler, magnifying glasses inside swastika-adorned boxes, a medical device for measuring heads, a statue of the Reichsadler, an hourglass, a box of harmonicas, a swastika-engraved knife, and a photographic negative of Hitler "holding a magnifying glass similar to those found in the boxes." Argentine authorities have said that the findings are original, and that it's the largest trove of Nazi artifacts in the country's history.
The Legend of Zelda: The Minish Cap / Phantom Hourglass Legendary Edition
To introduce French perfumer Diptyque's revamped hourglass fragrance diffuser, Le Sablier, Rustan's tapped some of Manila's most prominent interior design personalities last week to design personal spaces where they would choose to spend an hour and just savor the moment-60 precious minutes to reflect and meditate, unwind, or just be.
In her latest memoir, Hourglass: Time, Memory, Marriage, she examines her marriage to journalist and screenwriter Michael Maren.
Firstly, the one-point quadrature of many methods (e.g., dynamic finite element method, element-free Galerkin method [17], and mesh-free particle method [18]) will lead to unstable hourglass deformation and zero-energy mode, typically manifesting as the rapid jagged oscillations of nodes.