(classical) to say

nebula

black cloud

weather; unstable situation

see 白雲區|白云区[Bai2 yun2 Qu1]

white cloud

floating clouds; fleeting; transient

and so on; so and so; many and confused

(computing) to migrate to the cloud

Evian, mineral water company; Évian-les-Bains, resort and spa town in south-eastern France

see 凌雲縣|凌云县[Ling2 yun2 Xian4]

(lit. and fig.) towering; lofty; high

cirrus (cloud)

(meteorology) cloudy

like the clouds in the sky (i.e. numerous)

see 密雲區|密云区[Mi4 yun2 Qu1]

dust cloud

stratus (cloud)

see 左雲縣|左云县[Zuo3 yun2 Xian4]

see 慶雲縣|庆云县[Qing4 yun2 Xian4]

rosy clouds; CL:朵[duo3]

war clouds; atmosphere of impending conflict

that's why it is called...

see 灌雲縣|灌云县[Guan4 yun2 Xian4]

a haze of doubts and suspicions

see 祥雲縣|祥云县[Xiang2 yun2 Xian4]

magic cloud

cumulus; heap cloud

see 紫云苗族布依族自治縣|紫云苗族布依族自治县[Zi3 yun2 Miao2 zu2 Bu4 yi1 zu2 Zi4 zhi4 xian4]

beautiful clouds

see 縉雲縣|缙云县[Jin4 yun2 Xian4]

as the saying goes...

Zhao Yun (-229), general of Shu in Romance of the Three Kingdoms

see 連雲區|连云区[Lian2 yun2 Qu1]

dark cloud

Chen Yun (1905-1995), communist leader and economist

clear sky; fig. high official position; noble

Ma Yun (1964-), aka Jack Ma, Chinese billionaire businessman, co-founder of Alibaba 阿里巴巴[A1 li3 ba1 ba1]

to ride the clouds; fig. self-satisfied; arrogant

Gao Yun (died 409) emperor of Northern or Later Yan dynasty

diffuse nebula

Lau Ching-Wan (1964-), Hong Kong actor

cirrostratus (cloud); also written 捲層雲|卷层云[juan3 ceng2 yun2]

cirrocumulus (cloud)

stratocumulus cloud

(astronomy) dark nebula; absorption nebula

undulatus

funnel cloud

nuée ardente; hot cloud of volcanic ash