What kind of electronic part is this on the circuit board?
You have two potentiometers marked &quot;B 104&quot; and &quot;A 104&quot;: -

I would estimate that these are 100 kΩ potentiometers (104 means 10 followed by 4 zeros = 100000 Ω). The &quot;A&quot; and &quot;B&quot; prefixes are important too. Read this from wiki regarding the meaning but, in short: -

A stands for logarithmic taper
B stands for linear taper



What means 09HBF25?

I suspect that may be some manufacturer's prefix part number with the A or B 104 being the full part number.

What kind of part is this?

It's a potentiometer.