Reference charts
A reference sheet promises completeness within its subject. Every letter, every status code, every prefix, every phase — not a selection of the handy ones. That promise is what makes it worth wall space: you can stop wondering whether the answer is on there.
It is the largest kind in the catalogue and it runs across most of the subjects — alphabets and codes, the geography of instruments, the tea and coffee sheets, units and paper formats, the planets and the Moon.
Because they are dense, they reward the larger print. A3 is usually the right call for anything read from more than a metre away.
PAWN
one square forward, two on its first move, capturing diagonally — and never going back
QUEEN
file, rank and diagonal together — from twenty-one squares to twenty-seven
ROOK
fourteen squares from any square of the board — the one piece that does not care where it stands
MARTIAL ARTS FAMILY TREE
fifteen schools and thirteen lines of transmission — every arrow is a documented apprenticeship, not a legend
CURRENCY MINOR UNITS
178 codes in the standard: 139 currencies divide by 100, 17 do not divide at all, 7 divide by 1,000 — and 25 codes are not money you can spend
NEEDLES AND YARN
knitting needle sizes in three systems — metric, old UK, US — and the 0–7 yarn weights per the Craft Yarn Council
LEAP SECONDS
27 seconds added to UTC since 1972, none since 2016 — the longest run there has ever been
PHOTO PRINT SIZES
how many millimetres each size really is, and how much of the frame goes under the knife
SI BASE UNITS
seven constants given an exact number — and the seven units that follow from them
SI UNITS WITHOUT NAMES
the endless rest: assembled from the base and the named units, and never with a factor
SI DERIVED UNITS
twenty-two with names of their own — and what each one is made of
SI PREFIXES
from quetta to quecto · twenty multipliers