In mainly Black and LGBTQ communities in the United States, rest in power is an expression used to mourn, remember or celebrate a deceased person, especially someone who is thought to have struggled against systemic prejudice such as racism, homophobia or transphobia, or suffered because of it. It has been used to eulogize victims of hate crimes while protesting the social inequality and institutionalized discrimination that may have led to their deaths. "Rest in power" is also used to pay tribute to a public figure who made a difference in the lives of minority communities and was significant and respected within them.
As an alternative to the traditional Christian phrase "rest in peace", "rest in power" suggests that even in death the deceased person has the power to make a difference to others. The phrase is a statement of solidarity and a call to continue the struggle for social justice, as the deceased person will not be able to 'rest in peace' until society itself is in peace. However, it also implies the hope that the deceased person can now rest, free from oppression.