陞

A phono-semantic compound composed of:

阜 (hill; mound) — semantic component, indicating elevation; 𡉼 — phonetic component. The character conveys the idea of going up a hill, which developed into the general meaning to ascend or rise.
Semantic development: - to climb a hill; - to rise upward; - to be promoted or elevated.

승진 (陞進) — promotion (in rank or position)

상승 (上陞) — rise; increase (rare form; usually 上昇)

陞 is an older or more formal variant, while 升 and 昇 are more commonly used today. The character is often associated with promotion or elevation in status, especially in classical or formal texts.
Related characters: 升 — to rise; measuring unit

昇 — to rise (especially of the sun)

上 — up; above