Plinth (hieroglyph)
The Ancient Egyptian Plinth-(shaped) hieroglyph is Gardiner sign listed no. Aa15 for the shape of a plinth, side view.
Plinth use as mortuary: "Justified"
Many examples honoring Ancient Egyptians in later life, and commemorating them show the use of two hieroglyphs, often paired, vertical, or horizontal, the Plinth with the Spoon-or-Oar shape (hieroglyph);
The meaning is often translated, justified, worthy, venerable, etc.
They are often paired together, but are also shown in temples and reliefs, each in the two different axes, (one vertical, one horizontal).
The Egyptian hieroglyph alphabetic letters
The following two tables show the Egyptian uniliteral signs. (24 letters, but multiple use hieroglyphs)
See also
Gardiner's Sign List#Aa. Unclassified
References
Collier, Mark, and Manley, Bill, How to Read Egyptian Hieroglyphs, c 1998, University of California Press, 179 pp, (with a word Glossary, p 151-61: Title Egyptian-English vocabulary; also an "Answer Key", 'Key to the exercises', p 162-73) {hardcover, ISBN 0-520-21597-4}