- 三十八 sānshíbā thirty-eightthe number thirty-eight
- 十八般武艺 shíbābānwǔyì 18 kinds of weaponsThe traditional eighteen types of martial arts weapons, such as the sword, spear, axe, and halberd
- 十八层地狱 shíbācéngdìyù eighteen levels of hellThe eighteen levels of hell in Buddhist and folk mythology where the souls of evil people suffer for their sins
- 十八罗汉 shíbāluóhàn Eighteen ArhatsThe eighteen saints or arhats of Buddhism who are said to have stayed in the world to protect the dharma; they are commonly depicted as a group in Buddhist temples.
- 女大十八变 nǚdàshíbābiàn a girl changes from childhood to adulthoodA young woman becomes very different in appearance and personality from the little girl she once was; often used to remark on how much more beautiful a girl has become as she grows up.
- 二十八宿 èrshíbāxiù Twenty-Eight MansionsThe twenty-eight constellations of the traditional Chinese astronomical system, which are divided into four groups of seven representing the four cardinal directions.
- 九十八 jiǔshíbā ninety-eight
- 五十八 wǔshíbā fifty-eightthe number fifty-eight
- 十八变 shíbābiàn multiple changesUsed to describe something that undergoes many transformations or variations, as seen in the phrase [[女大十八变|女大十八變|nu:3 da4 shi2 ba1 bian4]] regarding a young woman's changing appearance during puberty
- 茄二十八星瓢虫 qié'èrshíbāxīngpiáochóng 28-spotted ladybirdthe 28-spotted ladybird or hadda beetle; Henosepilachna vigintioctopunctata
- 三十八度线 sānshíbādùxiàn 38th parallelThe line of latitude 38 degrees north, which served as the dividing line between the US and Soviet occupation zones in Korea after World War II and preceded the current Demilitarized Zone (DMZ)
- 二十八星宿 èrshíbāxīngxiù twenty-eight mansionsthe twenty-eight constellations of the Chinese zodiac along the celestial equator and ecliptic
- 十八地狱 shíbādìyù eighteen levels of hellthe eighteen layers of hell in Buddhist and Taoist belief; a state of extreme suffering or utter misery
- 十八学士 shíbāxuéshì Eighteen Scholarsgroup of eighteen distinguished academics and officials serving under the future Emperor Taizong of Tang during the early Tang Dynasty
- 封家十八姨 fēngjiāshíbāyí goddess of windthe traditional Chinese goddess of the wind, often appearing in folklore and literature
- 打入十八层地狱 dǎrùshíbācéngdìyù to banish to the lowest depths of hellTo cast someone into the lowest level of hell; used to describe being severely punished or banished to an extremely painful and dark place for committing heavy crimes.