R# - Resistor

C# - Capacitor

JP# - Jumper wire

U# - Microcontroller Unit

B# - Button

T# - Transistor? Transformer?

X# - ???

VBAT - Backup voltage?

D# - Diode

LD# - LED

SB# - Solder bridge

CN# - Connector

GND - Ground

@5V, VCC, VIN, PWR, VDD - Power (All Different! Check page 60 of chip datasheet)

AVDD - Analog power

PWM - Pulse Width Modulation

RST - Reset

NRST - Negative Reset

SCK, MISO, MOSI, CS - SPI protocol

TX, RX - UART protocol