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The Engraved Hourglass Nebula (also known as MyCn 18) is a young planetary nebula in the southern constellation Musca about 8,000 light-years from Earth. It was discovered by Annie Jump Cannon and Margaret W. Mayall during their work on an extended Henry Draper Catalogue (the catalogue was built between 1918 and 1924).
The HOURGLASS is worn on each succeeding award of the RESERVE MEDAL of each of the branches of service. A BRONZE Hourglass indicates the 1st Award, SILVER the 2nd, and GOLD the 3rd. The GOOD CONDUCT MEDAL CLASP is worn on the ribbons of the Good Conduct Medals of the Army and Air Force to indicate subsequent awards. The number of knots and color indicate the number of awards: Bronze with 1 knot = 1st, with 2 knots = 5th. Silver with 1 knot = 6th, with 2 knots =10th.