If you came across “imgrsru” in a critical document or search, attempt to correct it to a plausible word based on context. If you are the one who coined it, consider defining it clearly for your audience.

: The "source" attribute that tells the browser where to find the file. .RU : The Russian domain where the servers lived. ⚖️ The Darker Chapters

I'm assuming you meant "Instagram". Here's some informative content covering Instagram: