To capitalize on the Calculator trend, the direct play is Texas Instruments (TXN), the dominant supplier of calculator ICs and graphing calculators used in education. For broader exposure to the hardware underpinnings, consider STMicroelectronics (STM) and NXP Semiconductors (NXPI), which provide the components that power calculator devices. You can gain indirect access to calculator brands via Sharp (6753.T) or Hon Hai Precision Industry (2317.TW), the latter being the parent of Sharp, while entrepreneurial opportunities include building a calculator-focused app or accessories for graphing calculators.