Инструкция по безопасности висит рядом с аварийным выходом.

The safety instruction sheet is hanging next to the emergency exit.

Breakdown of Инструкция по безопасности висит рядом с аварийным выходом.

• висеть: to hang
• рядом с: next to
• по: on
• выход: the exit

Questions & Answers about Инструкция по безопасности висит рядом с аварийным выходом.

Why is it по безопасности and not something like безопасности by itself?

По безопасности is a fixed and very common way to say about safety / regarding safety / on safety.

So:

• инструкция по безопасности = safety instructions / an instruction on safety
• literally, it is something like instruction concerning safety

In Russian, many nouns are followed by по + dative to show topic or area:

• курс по русскому языку = a course in Russian
• книга по истории = a book on history
• советы по здоровью = advice on health

Here, безопасность becomes dative singular:

• nominative: безопасность
• dative: безопасности

So по безопасности is grammatically normal and idiomatic.

What case is безопасности, and why does it have that ending?