third of the ten Heavenly Stems 十天干[shi2 tian1 gan1]; third in order;
Depicts a platform to put things on. The current meaning is a phonetic loan.
《說文》：“丙，位南方，萬物成炳然。陰气初起，陽气將虧，从一入冂。一者，陽也。丙承乙，象人肩。”
pedestal