olemus
(1) häireseadet käivitav nupplüliti,
võib olla varjatud, näiteks jalaga vajutatav või
olla paigaldatud ohtlikele tänavaaladele

Collins English Dictionary:
1. a button or switch that operates any of various safety devices, for use in an emergency
http://2.bp.blogspot.com/-9EiMPIvWUs0/Ti7OtK5ViAI/AAAAAAAAAKU/lx8rXif7teM/s1600/fun145_panic_button_300hand.jpg

http://trak.in/wp-content/uploads/2016/04/Help-Panic-Button.jpg

http://ak7.picdn.net/shutterstock/videos/14308087/thumb/1.jpg

https://duckduckgo.com/?q=panic+button&t=h_&iax=images&ia=images

(2) lubamatust saadetisest teavitamise nupp sotsiaalvõrguliideses

Collins English Dictionary:
2. a button on the user interface of a social networking site that may be used to report offensive, obscene, or suspicious postings
https://www.famemagazine.co.uk/%E2%80%9Cpanic-button%E2%80%9D-a-warning-to-all-social-network-users/

vt ka
- häireseade