LAUNDRY CARE SYMBOLS
the 28 symbols of the everyday clothing tag per ISO 3758:2023: five treatments in a fixed order, sharing one set of modifiers
THE ASCII TABLE
all 128 positions: the column is the three high bits, the row is the four low ones
THE BASE32 ENCODING
forty bits to a quantum: five bytes, eight characters and five padding cases
THE BASE64 ENCODING
three bytes become four characters: the alphabet, the tail, and what the "=" at the end is for
HTTP METHODS · 2026
ten methods per RFC 9110, 5789 and 10008: which are safe, which are idempotent, which can be retried
SPECIAL-PURPOSE IPv4 BLOCKS
14 blocks that belong to no host on the internet — 13.8 % of the address space, of which exactly one eighth is multicast and reserved
KANBAN
the board, the limit on work in progress, and the four metrics that measure flow
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