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.
CROCHET SYMBOLS
the standard chart symbols, abbreviations and US/UK name differences — per the Craft Yarn Council standards
MORSE CODE
26 letters and 10 digits · dot, dash
PHONETIC ALPHABET
the ICAO standard · for radio and telephone
FLAG SEMAPHORE
two flags, eight positions 45 degrees apart — all 26 letters; after the numerals sign A–I read as 1–9 and K as 0
MARITIME SIGNAL FLAGS
the twenty-six alphabet flags of the International Code of Signals — and what each one means alone
NUMERAL PENNANTS AND SUBSTITUTES
how to fly the same flag twice in one group with only one set aboard
THE BASKETBALL
four FIBA sizes with their circumference and mass — and why the rules set a bounce, not a pressure
FOOTBALL: THE BALL
Law 2, three codes of the game, five sizes and three FIFA quality marks — what a ball must survive
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
KNIGHT
the nearest square off the lines, over pieces, and four moves to the square next door
THE MOVES OF THE PIECES
all six moves from one square, the article of the rules and how many squares each piece holds
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
THE WORLD'S TIME OFFSETS
37 offsets from UTC−11:00 to UTC+14:00 — a spread of 25 hours over a 24-hour day
THE AMERICAN WIRE GAUGE
forty-four sizes derived from two diameters and one law of progression
BICYCLE CLASSES
frame, wheel by ISO 5775 and handlebar — three signs of a class, and what the frame is rated for
CAR CLASSES
segments A to F by length and bodies by box count — how to name any car you see