Letter Sets
Inspired by both the List of Things and a puzzle I wrote last year , this is a list of sets of letters. Entries in brackets are considered semi-canonical; they exist in some lists but aren't definitively in the set. Sets of Three RGB - Light colours XYZ - Cartesian axes TMO - Dash only Morse code BLT - Sandwich Sets of Four NESW - Cardinal directions UDLR - Orthogonal directions AJQK - Playing cards CMYK - Printer inks SATB - Voice types ACGT - DNA nucleobases ACGU - RNA nucleobases WASD - Keyboard movement ABXY - Xbox controller buttons HJKL - Vim navigation buttons EISH - Dot only Morse code Sets of Five RNBQK (+P) - Chess pieces ACGTU - Nucleobases PRNDL (+SB) - Automatic gearstick LITSO - Free tetrominoes AEIOU (+Y) - Vowels GJPQY - Descenders (lower case) ABCDF - US Letter grades DRABC - First Aid primary survey LGBTQ (+IA) - 🏳️🌈 Sets of Six UDSCTB - Quark flavours UDLRFB - Faces of a Rubik's Cube PEMDAS/BODMAS/BID...