STM32F103RCT6 the meaning of each field:

STM32 series (chip) : STM32 represents the ARM architecture (M kernel 32-bit microcontrollers

Series 103 (chip) : 101 basic, usb basic (usb), 102, 103 on behalf of the enhanced series, 105 or 107 interconnected

F (product type) : F on behalf of the general series

R number (pin) : T=36, 48, C=R=64, V=100, Z=144

(C) flash memory capacity: 4=16 k, 6=32 k, 8=64 k, B=128 k, C=256 k, D=384 k, E=512 k

T (table size) :
H on behalf of BGA encapsulation
T representative LQFP encapsulation
U represent VFQFPN encapsulation
Y represent WLCSP64

6 (working temperature range) : representative - 40-85 degrees Celsius, 7 representative - 40-105 - c