The vertical carob M29 (Gardiner M29) and the vertical date M30 (Gardiner M30) have identical meanings in the Egyptian hieroglyphic language of "sweet", and related words. The carob (hieroglyph) is a ripe carob pod w/seeds, and its meaning of "sweet" extends to items of taste, smell, and touch.Schumann-Antelme, and Rossini, 1998. Illustrated Hieroglyphics Handbook, triliteral T13, pp. 268-69.
In Budge's compendium dictionary, there are fifteen entries with , and related words. Six of them are a doubling of the word, related to passion, concubines, etc.
See also
Gardiner's Sign List#M. Trees and Plants List of Egyptian hieroglyphs
References