防火墙 fánghuǒqiáng firewall
How to remember 防火墙: 防 to protect + 火 fire (Kangxi radical 86) + 墙 wall = firewall.
Characters
How it is used
- Both a literal fire wall and a computer firewall - 公司的防火墙拦截了这封邮件 (gōngsī de fánghuǒqiáng lánjié le zhè fēng yóujiàn) the company firewall blocked this email.
- In modern usage the network-security sense dominates; the architectural fire-barrier sense is original.
- Also figurative: a barrier that keeps risk from spreading (设置防火墙 to build a safeguard).