Voltage divider network, Regulator resistance, variable resistor, input voltage

 LM317 Series 100 mA 1.2 to 37 V Adjustable Positive Voltage Regulator - SOIC-8

https://www.futureelectronics.com/p/semiconductors--analog--regulators-reference--linear-regulators/lm317ld13tr-stmicroelectronics-8959751