If you use greek letters, mathematical symbols, or even particular emojis a lot you can make easy keyboard shortcuts for them in System Preferences. This makes typing notes and equations much easier. :
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Amazon.com: Adesso WKB-1330CB - Wireless Keyboard and Mouse Combo, Desktop Keyboard, Ambidextrous Mouse, Multimedia Hotkeys, Long Battery Life with USB Nano Receiver for Desktop/PC/Windows XP/7/8/10,Black : Electronics