| 1 | 〢 | 〢 | èr | er4 | numeral 2 in Suzhou numeral system 苏州码子 | | |
| 2 | 2019冠状病毒病 | 2019冠狀病毒病 | èr líng yī jiǔ guān zhuàng bìng dú bìng | er4 ling2 yi1 jiu3 guan1 zhuang4 bing4 du2 bing4 | COVID-19, the coronavirus disease identified in 2019 | | |
| 3 | 21三体综合症 | 21三體綜合症 | èr shí yī sān tǐ zōng hé zhèng | er4 shi2 yi1 san1 ti3 zong1 he2 zheng4 | trisomy; Down's syndrome | | |
| 4 | 502胶 | 502膠 | wǔ líng èr jiāo | wu3 ling2 er4 jiao1 | cyanoacrylate glue | | |
| 5 | 中国制造2025 | 中國製造2025 | zhōng guó zhì zào èr líng èr wǔ | Zhong1 guo2 Zhi4 zao4 er4 ling2 er4 wu3 | Made in China 2025, strategic plan to upgrade Chinese industry especially in high-tech areas, approved by China's State Council in 2015 | | |