PHASES OF THE MOON
eight phases · a full cycle of 29.53 days
$1.50
THE SOLAR SYSTEM
eight planets · size, distance, year and day
Free
BITS, BYTES, KILOBYTES
two scales · 1000 and 1024 · why a drive looks smaller
$1.50
CSS FLEXBOX
main axis and cross axis · which property belongs to which
$1.50
FLOWCHART SYMBOLS
10 shapes, and one algorithm drawn with them
$1.50
GIT WORKING AREAS
four areas · the command that moves code between them
Free
HTTP STATUS CODES
five classes · twenty codes you meet every day
$1.50
THE SELECT STATEMENT
8 clauses in the order you write them — and the order they take effect in
$1.50
MORSE CODE
26 letters and 10 digits · dot, dash
Free
PHONETIC ALPHABET
the ICAO standard · for radio and telephone
$2.50
IMPERIAL UNITS
convert in your head · without a calculator
Free
PAPER SIZES
the A series · from A0 to A6
$1.50