STM32
hardwareA family of 32-bit ARM Cortex-M microcontrollers made by STMicroelectronics
Pronunciation
Correct
S-T-M-thirty-two
/ɛs tiː ɛm ˈθɜːrti tuː/
The 'STM' prefix (STMicroelectronics) is spelled out; '32' is read as thirty-two.
Source: www.st.com(official spec)