SUBNET MASKS
from /0 to /32: the mask, how many addresses a block holds, and how many of them go to hosts
UML DIAGRAMS
the fourteen kinds, and the notation a class diagram is made of
PERCENT-ENCODING IN URIs
128 ASCII positions: 66 unreserved, 18 delimiters, 43 that must always be encoded — and the "%" itself
THE UTF-8 ENCODING
how a Unicode code point falls into one, two, three or four bytes — and which bytes never appear
VIM COMMANDS
modes, motions and editing per the Vim 9.1 help — and the grammar that composes them into commands
THE BEAUFORT SCALE
thirteen forces of wind — from water like a mirror to a wave of fourteen metres
COLOUR GAMUTS
sRGB, Display P3, Rec. 2020 and ProPhoto RGB on the CIE 1931 chromaticity diagram
PHONETIC ALPHABET
the ICAO standard · for radio and telephone
BISHOP
a diagonal at any distance — and the half of the board that will never come
KING
one square in any direction, from three in the corner to eight in the middle, and castling
THE MOVES OF THE PIECES
all six moves from one square, the article of the rules and how many squares each piece holds
QUEEN
file, rank and diagonal together — from twenty-one squares to twenty-seven