The phrase "indelible part" means something that cannot be erased, removed, or forgotten. It describes something that has a strong and lasting impact, leaving a permanent mark or influence. Full definition
But sorry, Hitch, the secret's out — Norman Bates and his best friend (his mother) are now indelible parts of pop culture. (csmonitor.com)
I am confident this regrouping ensures that Remington will continue as both a strong company and an indelible part of our national heritage.» (prnewswire.com)
Daniels, whose offstage name is Stephanie Clifford, seems well on her way to becoming to Donald Trump what Monica Lewinsky was to Bill Clinton — an indelible part of the narrative surrounding his administration. (adage.com)