Number + 点
三点 (sān diǎn) means 'three o'clock.' Like all clock times in Chinese, it is formed by placing the number before 点 (diǎn). It is used in time expressions such as schedules and daily routines.
我们三点在咖啡店见吧。
Wǒmen sān diǎn zài kāfēi diàn jiàn ba.
Let's meet at the coffee shop at three.
会议三点就结束了。
Huìyì sān diǎn jiù jiéshù le.
The meeting ended at three.
她每天下午三点去接孩子。
Tā měitiān xiàwǔ sān diǎn qù jiē háizi.
She goes to pick up her child at three every afternoon.