signs of suicidal behaviour
https://www.suicideprograms.com.au/warning-signs/warning-signs/

Do you have a loved one or someone in your circle who has given you second thoughts about taking your own life? The warning signs of suicide are often subtle and challenging to understand. Our advanced program of suicide prevention in Australia aims to raise awareness of suicide, improve one's comprehension of warning signals, pinpoint protective and risk factors, and strengthen one's willingness and capacity to help someone who is suicidal at risk.