This is the 4339th most frequent Russian word.
бл
"Бл" is an abbreviation or shorthand often used informally in Russian, most commonly as a truncated form of the expletive "блядь," which translates to a vulgar term like "damn" or "f***" in English, depending on context.
This uses the word 'бл' as part of the word 'блестящие' which means 'sparkling', referring to visual qualities.
Блестящие звезды украшали ночное небо.
The sparkling stars adorned the night sky.
Here, 'бл' is part of 'блокнот', which means 'notebook', a common item for writing notes.
Блокнот лежал на столе возле лампы.
The notebook was lying on the table near the lamp.
The word 'бл' appears in 'блестящим', meaning 'brilliant', used metaphorically to describe excellence.