茜 (pronounced あかね “akane”) is the Japanese name for the madder plant, whose roots can be used to make a deep red dye. The word is a combination of あか (“aka”=red) and ね (“ne”=root). The kanji 茜 is a combination of the “plant” radical 艹 on the top and the kanji for “west” 西 on the bottom: madder red comes from a plant and looks like the western sky at sunset.
The word 茜 is usually used for:
Names (especially female given names)
Describing sunsets, especially in the form 茜色 (あかねいろ/akane-iro “madder-color”)